Federal Home Loan Bank of Indianapolis 10-Q 8 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Entity Information [Line Items]	'	'
Entity Registrant Name	'Federal Home Loan Bank of Indianapolis	'
Entity Central Index Key	'0001331754	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Amendment Flag	'false	'
Entity Common Stock, Common B Shares Outstanding	'	16,908,928

Statements_of_Condition_Unaudi

Statements of Condition (Unaudited) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Assets:	'		'
Cash and Due from Banks	$514,383		$105,472
Interest-Bearing Deposits	487		48
Securities Purchased Under Agreements to Resell	2,700,000		3,250,000
Federal Funds Sold	245,000		2,110,000
Available-for-Sale Securities (Notes 3 and 5)	3,688,783		3,980,580
Held-to-Maturity Securities (Estimated Fair Values of $7,437,226 and $7,738,596, respectively) (Notes 4 and 5)	7,321,459	[1]	7,504,643	[1]
Advances (Note 6)	18,796,297		18,129,458
Mortgage Loans Held for Portfolio, net of allowance for credit losses of $(5,500) and $(10,000), respectively (Notes 7 and 8)	6,159,647		6,001,405
Accrued Interest Receivable	81,966		87,455
Premises, Software, and Equipment, net	34,047		28,144
Derivative Assets, net (Note 9)	7,655		821
Other Assets	27,111		29,610
Total Assets	39,576,835		41,227,636
Liabilities:	'		'
Deposits (Note 10):	1,114,509		1,787,151
Consolidated Obligations, Discount Notes	7,804,773		8,924,085
Consolidated Obligations, Bonds	27,623,120		27,407,530
Total Consolidated Obligations	35,427,893		36,331,615
Accrued Interest Payable	94,866		87,777
Affordable Housing Program Payable (Note 12)	39,774		34,362
Derivative Liabilities, net (Note 9)	187,234		201,115
Mandatorily Redeemable Capital Stock (Note 13)	255,319		450,716
Other Liabilities	71,733		119,058
Total Liabilities	37,191,328		39,011,794
Commitments and Contingencies (Note 18)	'		'
Capital (Note 13):	'		'
Total Capital Stock Putable	1,684,015		1,634,300
Retained Earnings:	'		'
Unrestricted	617,186		549,773
Restricted	69,404		41,827
Total Retained Earnings	686,590		591,600
Total Accumulated Other Comprehensive Income (Loss) (Note 14)	14,902		-10,058
Total Capital	2,385,507		2,215,842
Total Liabilities and Capital	39,576,835		41,227,636
Class B-1 issued and outstanding shares: 16,798 and 16,327, respectively [Member]	'		'
Capital (Note 13):	'		'
Total Capital Stock Putable	1,679,835		1,632,720
Class B-2 issued and outstanding shares: 42 and 16, respectively [Member]	'		'
Capital (Note 13):	'		'
Total Capital Stock Putable	$4,180		$1,580
[1]	Carrying value of HTM securities represents amortized cost after adjustment for non-credit OTTI recognized in AOCI.

Statements_of_Condition_Unaudi1

Statements of Condition (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Per Share data, unless otherwise specified
HTM securities	$7,437,226	$7,738,596
Allowance for credit losses	($5,500)	($10,000)
Common Stock Putable, Par Value Per Share	$100	$100
Class B-1 [Member]	'	'
Common Stock, Shares, Issued	16,798	16,327
Common Stock, Shares, Outstanding	16,798	16,327
Class B-2 [Member]	'	'
Common Stock, Shares, Issued	42	16
Common Stock, Shares, Outstanding	42	16

Statements_of_Income_Unaudited

Statements of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Income:	'	'	'	'
Advances	$30,531	$42,089	$93,763	$131,002
Prepayment Fees on Advances, net	273	1,497	8,127	4,330
Interest-Bearing Deposits	87	271	476	745
Securities Purchased Under Agreements to Resell	71	1,074	954	2,534
Federal Funds Sold	380	672	1,572	1,652
Available-for-Sale Securities	6,983	10,843	23,440	31,617
Held-to-Maturity Securities	34,998	38,477	106,008	123,178
Mortgage Loans Held for Portfolio, net	59,763	62,615	186,186	195,733
Other, net	574	569	1,121	1,322
Total Interest Income	133,660	158,107	421,647	492,113
Interest Expense:	'	'	'	'
Consolidated Obligation Discount Notes	1,732	2,492	6,101	5,095
Consolidated Obligation Bonds	77,552	93,158	235,630	295,007
Deposits	25	20	70	71
Mandatorily Redeemable Capital Stock	2,225	3,355	6,713	10,592
Total Interest Expense	81,534	99,025	248,514	310,765
Net Interest Income	52,126	59,082	173,133	181,348
Provision for (Reversal of) Credit Losses	314	5,634	-3,451	7,917
Net Interest Income After Provision for Credit Losses	51,812	53,448	176,584	173,431
Other Income (Loss):	'	'	'	'
Total Other-Than-Temporary Impairment Losses	0	0	0	-6
Non-Credit Portion Reclassified to (from) Other Comprehensive Income, net	0	-14	-1,924	-3,588
Net Other-Than-Temporary Impairment Losses, credit portion	0	-14	-1,924	-3,594
Net Realized Gains from Sale of Available-for-Sale Securities	0	0	17,135	0
Net Gains (Losses) on Derivatives and Hedging Activities	-125	-3,056	10,671	-7,443
Service Fees	225	236	684	723
Standby Letters of Credit Fees	119	192	873	680
Other, net	332	474	1,024	979
Total Other Income (Loss)	551	-2,168	28,463	-8,655
Other Expenses:	'	'	'	'
Compensation and Benefits	14,101	8,516	33,153	26,565
Other Operating Expenses	4,520	3,893	13,002	12,022
Federal Housing Finance Agency	550	838	1,914	2,674
Office of Finance	640	592	2,104	1,872
Other	354	243	925	668
Total Other Expenses	20,165	14,082	51,098	43,801
Income Before Assessments	32,198	37,198	153,949	120,975
Assessments:	'	'	'	'
Affordable Housing Program Assessments	3,442	4,056	16,066	13,157
Net Income	$28,756	$33,142	$137,883	$107,818

Statements_of_Comprehensive_In

Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net Income	$28,756	$33,142	$137,883	$107,818
Other Comprehensive Income:	'	'	'	'
Net Change in Unrealized Gains (Losses) on Available-for-Sale Securities	2,392	3,606	-9,468	-1,579
Non-Credit Portion of Other-Than-Temporary Impairment Losses on Available-for-Sale Securities:	'	'	'	'
Reclassification of Non-Credit Portion to Other Income	0	14	1,924	3,592
Net Change in Fair Value Not in Excess of Cumulative Non-Credit Losses	-84	32,311	35,095	64,096
Unrealized Gains (Losses)	2,474	3,301	7,615	8,055
Reclassification of Net Realized Gains From Sale to Other Income	0	0	-17,135	0
Net Non-Credit Portion of Other-Than-Temporary Impairment Losses on Available-for-Sale Securities	2,390	35,626	27,499	75,743
Non-Credit Portion of Other-Than-Temporary Impairment Losses on Held-to-Maturity Securities:	'	'	'	'
Reclassification of Non-Credit Portion from Other Income	0	0	0	-4
Accretion of Non-Credit Portion	18	18	55	64
Net Non-Credit Portion of Other-Than-Temporary Impairment Losses on Held-to-Maturity Securities	18	18	55	60
Pension Benefits	6,175	-570	6,874	-1,713
Total Other Comprehensive Income	10,975	38,680	24,960	72,511
Total Comprehensive Income	$39,731	$71,822	$162,843	$180,329

Statements_of_Capital_Unaudite

Statements of Capital (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'
Beginning Balance	'	'	$2,215,842	$1,947,188
Proceeds from Sale of Capital Stock	'	'	145,156	56,988
Net Shares Reclassified to Mandatorily Redeemable Capital Stock	'	'	-95,441	-3,513
Total Comprehensive Income	39,731	71,822	162,843	180,329
Distributions on Mandatorily Redeemable Capital Stock	'	'	-137	-27
Cash Dividends on Capital Stock (3.50% and 3.00% annualized, respectively)	'	'	-42,756	-35,201
Ending Balance	2,385,507	2,145,764	2,385,507	2,145,764
Capital Stock Class B Putable [Member]	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'
Beginning Balance	'	'	1,634,300	1,563,056
Beginning Balance, Shares	'	'	16,343	15,631
Proceeds from Sale of Capital Stock	'	'	145,156	56,988
Proceeds from Sale of Capital Stock, Shares	'	'	1,451	569
Net Shares Reclassified to Mandatorily Redeemable Capital Stock	'	'	-95,441	-3,513
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Shares	'	'	-954	-35
Ending Balance	1,684,015	1,616,531	1,684,015	1,616,531
Ending Balance, Shares	16,840	16,165	16,840	16,165
Retained Earnings Total [Member]	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'
Beginning Balance	'	'	591,600	497,673
Total Comprehensive Income	'	'	137,883	107,818
Distributions on Mandatorily Redeemable Capital Stock	'	'	-137	-27
Cash Dividends on Capital Stock (3.50% and 3.00% annualized, respectively)	'	'	-42,756	-35,201
Ending Balance	686,590	570,263	686,590	570,263
Retained Earnings, Unrestricted [Member]	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'
Beginning Balance	'	'	549,773	484,511
Total Comprehensive Income	'	'	110,306	86,254
Distributions on Mandatorily Redeemable Capital Stock	'	'	-137	-27
Cash Dividends on Capital Stock (3.50% and 3.00% annualized, respectively)	'	'	-42,756	-35,201
Ending Balance	617,186	535,537	617,186	535,537
Retained Earnings, Restricted [Member]	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'
Beginning Balance	'	'	41,827	13,162
Total Comprehensive Income	'	'	27,577	21,564
Distributions on Mandatorily Redeemable Capital Stock	'	'	0	0
Cash Dividends on Capital Stock (3.50% and 3.00% annualized, respectively)	'	'	0	0
Ending Balance	69,404	34,726	69,404	34,726
Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'
Beginning Balance	'	'	-10,058	-113,541
Total Comprehensive Income	'	'	24,960	72,511
Ending Balance	$14,902	($41,030)	$14,902	($41,030)

Statements_of_Capital_Unaudite1

Statements of Capital (Unaudited) (Parenthetical)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Statement of Stockholders' Equity [Abstract]	'	'
Annualized Dividend Rate on Capital Stock	3.50%	3.00%

Statements_of_Cash_Flows_Unaud

Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Operating Activities:	'	'
Net Income	$137,883	$107,818
Adjustments to reconcile Net Income to Net Cash provided by Operating Activities:	'	'
Amortization and Depreciation	74,755	71,124
Prepayment Fees on Advances, net of related swap termination fees	-4,335	-35,497
Changes in Net Derivative and Hedging Activities	33,983	64,779
Net Other-Than-Temporary Impairment Losses, credit portion	1,924	3,594
Provision for (Reversal of) Credit Losses	-3,451	7,917
Net Realized Gains from Sale of Available-for-Sale Securities	-17,135	0
Changes in:	'	'
Accrued Interest Receivable (adjusted for capitalized interest)	5,626	-1,115
Other Assets	7,526	4,384
Accrued Interest Payable	7,088	-6,273
Other Liabilities	1,141	3,932
Total Adjustments, net	107,122	112,845
Net Cash provided by Operating Activities	245,005	220,663
Changes in:	'	'
Interest-Bearing Deposits	280,168	-17,635
Securities Purchased Under Agreements to Resell	550,000	-2,150,000
Federal Funds Sold	1,865,000	659,000
Purchases of Premises, Software, and Equipment	-7,781	-9,073
Available-for-Sale Securities:	'	'
Proceeds from Maturities of Long-Term	64,978	53,162
Proceeds from Sales of Long-Term	129,471	0
Purchases of Long-Term	0	-1,310,060
Held-to-Maturity Securities:	'	'
Proceeds from Maturities of Long-Term	835,899	2,740,889
Purchases of Long-Term	-696,238	-1,144,255
Advances:	'	'
Principal Collected	31,058,385	34,329,908
Disbursed to Members	-32,041,661	-34,401,609
Mortgage Loans Held for Portfolio:	'	'
Principal Collected	1,095,371	1,108,146
Purchases of Loans and Participation Interests	-1,263,177	-1,006,139
Net Cash provided by (used in) Investing Activities	1,870,415	-1,147,666
Financing Activities:	'	'
Changes in Deposits	-671,842	142,535
Net Payments on Derivative Contracts with Financing Elements	-54,118	-62,539
Net Proceeds from Issuance of Consolidated Obligations:	'	'
Discount Notes	52,000,451	102,721,071
Bonds	16,351,138	18,821,982
Payments for Matured and Retired Consolidated Obligations:	'	'
Discount Notes	-53,119,138	-99,696,868
Bonds	-16,024,425	-21,432,000
Other Federal Home Loan Banks:	'	'
Proceeds from Borrowings	427,000	0
Payments for Maturities	-427,000	0
Proceeds from Sale of Capital Stock	145,156	56,988
Payments for Redemption/Repurchase of Mandatorily Redeemable Capital Stock	-290,975	-6,709
Cash Dividends Paid on Capital Stock	-42,756	-35,201
Net Cash provided by (used in) Financing Activities	-1,706,509	509,259
Net Increase (Decrease) in Cash and Due from Banks	408,911	-417,744
Cash and Due from Banks at Beginning of Period	105,472	512,682
Cash and Due from Banks at End of Period	514,383	94,938
Supplemental Disclosures:	'	'
Interest Paid	250,138	307,498
Affordable Housing Program Payments	10,654	11,455
Capitalized Interest on Certain Held-to-Maturity Securities	6,562	14,610
Par Value of Net Shares Reclassified to Mandatorily Redeemable Capital Stock	$95,441	$3,513

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	Note 1 - Summary of Significant Accounting Policies
	Basis of Presentation. The accompanying interim financial statements of the Federal Home Loan Bank of Indianapolis have been prepared in accordance with GAAP for interim financial information and with the instructions provided by the SEC. Accordingly, they do not include all of the information and disclosures required by GAAP for complete financial statements. The interim financial statements presented herein should be read in conjunction with our audited financial statements and notes thereto, which are included in our 2012 Form 10-K.
	The financial statements contain all adjustments that are, in the opinion of management, necessary for a fair statement of our financial position, results of operations and cash flows for the interim periods presented. All such adjustments were of a normal recurring nature. The results of operations for the periods presented are not necessarily indicative of the results to be expected for the full fiscal year or any other interim period.
	Our significant accounting policies and certain other disclosures are set forth in Note 1 - Summary of Significant Accounting Policies in our 2012 Form 10-K. There have been no material changes to these policies through September 30, 2013, except as noted below.
	We use certain acronyms and terms throughout these financial statements, which are defined in the Glossary of Terms. Unless the context otherwise requires, the terms "we," "us," and "our" refer to the Federal Home Loan Bank of Indianapolis or its management.
	Reclassifications. We have reclassified certain amounts from the prior periods to conform to the current period presentation. These reclassifications had no effect on Net Income, Total Comprehensive Income, Total Assets, Total Capital, or Cash Flows.
	Use of Estimates. The preparation of financial statements in accordance with GAAP requires us to make subjective assumptions and estimates that may affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported amounts of income and expense. Actual results could differ significantly from these estimates.
	Financial Instruments with Legal Right of Offset. We present certain financial instruments, including derivative instruments and securities purchased under agreements to resell, on a net basis when they have a legal right of offset and all other requirements for netting are met (collectively referred to as the netting requirements). For these financial instruments, we have elected to offset our derivative asset and liability positions, as well as cash collateral received or pledged, when we have met the netting requirements. We did not have any offsetting liabilities related to securities purchased under agreements to resell at September 30, 2013 and December 31, 2012.
	The net exposure for these financial instruments can change daily; therefore, there may be a delay between the time this exposure change is identified and additional collateral is requested, and the time when this collateral is received or pledged. Likewise, there may be a delay for excess collateral to be returned. For derivative instruments that meet the netting requirements, any excess cash collateral received or pledged is recognized as a derivative liability or derivative asset. Additional information regarding these transactions is provided in Note 9 - Derivatives and Hedging Activities. Based on the estimated fair value of the related collateral held, the securities purchased under agreements to resell were fully collateralized for the periods presented.

Recently_Adopted_and_Issued_Ac

Recently Adopted and Issued Accounting Guidance	9 Months Ended
	Sep. 30, 2013
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Recently Adopted and Issued Accounting Guidance	'
	Note 2 - Recently Adopted and Issued Accounting Guidance
	Inclusion of the Fed Funds Effective Swap Rate (or OIS) as a Benchmark Interest Rate for Hedge Accounting Purposes. On July 17, 2013, the FASB amended existing guidance to include the Fed Funds Effective Swap Rate, also referred to as OIS, as a United States benchmark interest rate for hedge accounting purposes. Including OIS as an acceptable United States benchmark interest rate, in addition to United States Treasuries and LIBOR, will provide a more comprehensive spectrum of interest rate resets to use as the designated benchmark interest rate risk component under the hedge accounting guidance. The amendments also remove the restriction on using different benchmark interest rates for similar hedges. The amendments apply to all entities that elect to apply hedge accounting of the benchmark interest rate, and are effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. However, we continue to designate LIBOR as our benchmark interest rate, and therefore, the adoption of this guidance has not had a material effect on our hedging activities.
	Joint and Several Liability Arrangements. On February 28, 2013, the FASB issued guidance for the recognition, measurement and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation within the scope of this guidance is fixed at the reporting date. This guidance requires an entity to measure these obligations as the sum of (i) the amount the reporting entity agreed to pay on the basis of its arrangement among its co-obligors and (ii) any additional amount the reporting entity expects to pay on behalf of its co-obligors. In addition, this guidance requires an entity to disclose the nature and the amount of the obligation as well as other information about those obligations. This guidance is effective for interim and annual periods beginning on or after December 15, 2013 and should be applied retrospectively to obligations with joint and several liabilities existing at the beginning of an entity's fiscal year of adoption. This guidance will not have any effect on our financial condition, results of operations or cash flows.
	Presentation of Comprehensive Income. On February 5, 2013, the FASB issued guidance to improve the transparency of reporting classifications out of AOCI. This guidance does not change the current requirements for reporting net income or comprehensive income in financial statements. However, it does require us to provide information about the amounts reclassified out of AOCI by component. In addition, we are required to present, either on the face of the financial statement where net income is presented or in the notes, significant amounts reclassified out of AOCI. These amounts must be presented based on the respective lines of net income if the amount reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under GAAP to be reclassified in their entirety to net income, we are required to cross-reference to other required disclosures that provide additional detail about these other amounts. This guidance became effective for interim and annual periods beginning on January 1, 2013 and was applied prospectively. The adoption of this guidance resulted in additional financial statement disclosures, but did not have any effect on our financial condition, results of operations or cash flows. See Note 14 - Accumulated Other Comprehensive Income (Loss)for additional disclosures required by this guidance.
	Disclosures about Offsetting Assets and Liabilities. On December 16, 2011, the FASB issued common disclosure requirements intended to help investors and other financial statement users better assess the effect or potential effect of offsetting arrangements on a company's financial position. This guidance was amended on January 31, 2013 to clarify that its scope includes only certain financial instruments that are either offset on the statement of condition or are subject to an enforceable master netting arrangement or similar agreement. This guidance requires us to disclose both gross and net information about derivative, repurchase and security lending instruments that meet this criteria. This guidance, as amended, became effective for interim and annual periods beginning on January 1, 2013, and was applied retrospectively for all comparative periods presented. The adoption of this guidance resulted in expanded interim and annual financial statement disclosures, but did not have any effect on our financial condition, results of operations or cash flows. See Note 9 - Derivatives and Hedging Activities for additional disclosures required by this guidance.
	Advisory Bulletin 2012-02. On April 9, 2012, the Finance Agency issued Advisory Bulletin 2012-02, Framework for Adversely Classifying Loans, Other Real Estate Owned, and Other Assets and Listing Assets for Special Mention ("AB-2012-02"). The guidance establishes a standard and uniform methodology for adversely classifying certain assets other than investment securities, and prescribes the timing of asset charge-offs based on these classifications. Such classification methodology and accounting treatment differ from our current methodology and accounting policy. AB-2012-02 states that it was effective upon issuance. However, the Finance Agency issued additional guidance that extended the effective date for classification purposes to January 1, 2014 and the effective date for financial reporting purposes to January 1, 2015. We are in the process of implementing this guidance and evaluating its effect on our financial condition, results of operations and cash flows, but we do not expect it to be material.

AvailableforSale_Securities

Available-for-Sale Securities	9 Months Ended
	Sep. 30, 2013
Available-for-sale Securities [Abstract]	'
Available-for-sale Securities	'
	Note 3 - Available-for-Sale Securities
	Major Security Types. The following table presents information on our AFS securities:
								Gross		Gross
			Amortized		Non-Credit			Unrealized		Unrealized			Estimated
	September 30, 2013		Cost (1)		OTTI			Gains		Losses			Fair Value
	GSE and TVA debentures		$	3,197,347	$	—		$	8,646	$	(5,779	)	$	3,200,214
	Private-label RMBS		470,754		(242		)	18,057		—			488,569
	Total AFS securities		$	3,668,101	$	(242	)	$	26,703	$	(5,779	)	$	3,688,783
	December 31, 2012
	GSE and TVA debentures		$	3,328,103	$	—		$	13,007	$	(672	)	$	3,340,438
	Private-label RMBS		649,826		(20,126		)	10,442		—			640,142
	Total AFS securities		$	3,977,929	$	(20,126	)	$	23,449	$	(672	)	$	3,980,580
	(1)	Amortized cost of AFS securities includes adjustments made to the cost basis of an investment for accretion, amortization, collection of principal, and, if applicable, OTTI recognized in earnings (credit losses) and fair-value hedge accounting adjustments.
	Premiums and Discounts. At September 30, 2013 and December 31, 2012, the amortized cost of our RMBS classified as AFS securities included OTTI credit losses, OTTI-related accretion adjustments, and unamortized purchase discounts resulting in net discounts of $68,584 and $110,664, respectively.
	Unrealized Loss Positions. The following table presents impaired AFS securities (i.e., in an unrealized loss position), which are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position.
			Less than 12 months					12 months or more					Total
			Estimated		Unrealized			Estimated		Unrealized			Estimated		Unrealized
	September 30, 2013		Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
	GSE and TVA debentures		$	998,420	$	(5,779	)	$	—	$	—		$	998,420	$	(5,779	)
	Private-label RMBS		—		—			7,719		(242		)	7,719		(242		)
	Total impaired AFS securities		$	998,420	$	(5,779	)	$	7,719	$	(242	)	$	1,006,139	$	(6,021	)
	December 31, 2012
	GSE and TVA debentures		$	398,265	$	(672	)	$	—	$	—		$	398,265	$	(672	)
	Private-label RMBS		—		—			471,359		(20,126		)	471,359		(20,126		)
	Total impaired AFS securities		$	398,265	$	(672	)	$	471,359	$	(20,126	)	$	869,624	$	(20,798	)
	Redemption Terms. The amortized cost and estimated fair value of non-MBS AFS securities by contractual maturity are presented below. MBS are not presented by contractual maturity because their actual maturities will likely differ from contractual maturities as borrowers have the right to prepay obligations with or without prepayment fees.
			September 30, 2013					December 31, 2012
			Amortized		Estimated			Amortized		Estimated
	Year of Contractual Maturity		Cost		Fair Value			Cost		Fair Value
	Due in one year or less		$	—	$	—		$	—	$	—
	Due after one year through five years		2,040,424		2,048,487			2,038,791		2,048,429
	Due after five years through ten years		1,123,231		1,118,511			1,197,884		1,200,979
	Due after ten years		33,692		33,216			91,428		91,030
	Total Non-MBS		3,197,347		3,200,214			3,328,103		3,340,438
	Total MBS		470,754		488,569			649,826		640,142
	Total AFS securities		$	3,668,101	$	3,688,783		$	3,977,929	$	3,980,580
	Realized Gains and Losses. The following table presents the proceeds, previously recognized OTTI credit losses including accretion, and gross realized gains and losses related to the sale of six OTTI AFS securities, only one of which was in an unrealized loss position. In the first quarter of 2013, we recorded an OTTI credit charge for this security, representing the entire difference between our amortized cost basis and its estimated fair value, which resulted in no gross realized losses related to the sale. We compute gains and losses on sales of investment securities using the specific identification method.
			Three Months Ended September 30,					Nine Months Ended September 30,
	Sales of AFS Securities		2013		2012			2013		2012
	Proceeds from sale		$	—	$	—		$	129,471	$	—
	Previously recognized OTTI credit losses including accretion		$	—	$	—		$	38,806	$	—
	Gross realized gains		$	—	$	—		$	17,135	$	—
	Gross realized losses		—		—			—		—
	Net Realized Gains from Sale of Available-for-Sale Securities		$	—	$	—		$	17,135	$	—
	As of September 30, 2013, we had no intention of selling the remaining AFS securities in an unrealized loss position nor did we consider it more likely than not that we will be required to sell these securities before our anticipated recovery of each security's remaining amortized cost basis.

HeldtoMaturity_Securities

Held-to-Maturity Securities	9 Months Ended
	Sep. 30, 2013
Held-to-maturity Securities [Abstract]	'
Held-to-Maturity Securities	'
	Note 4 - Held-to-Maturity Securities
	Major Security Types. The following table presents information on our HTM securities:
										Gross			Gross
										Unrecognized			Unrecognized
			Amortized		Non-Credit			Carrying		Holding			Holding			Estimated
	September 30, 2013		Cost (1)		OTTI			Value (2)		Gains (3)			Losses (3)			Fair Value
	GSE debentures		$	268,998	$	—		$	268,998	$	663		$	—		$	269,661
	MBS and ABS:
	Other U.S. obligations -guaranteed RMBS		3,090,243		—			3,090,243		53,058			(11,493		)	3,131,808
	GSE RMBS		3,781,786		—			3,781,786		81,713			(4,828		)	3,858,671
	Private-label RMBS		165,093		—			165,093		488			(1,802		)	163,779
	Manufactured housing loan ABS		13,410		—			13,410		—			(2,010		)	11,400
	Home equity loan ABS		2,186		(257		)	1,929		105			(127		)	1,907
	Total MBS and ABS		7,052,718		(257		)	7,052,461		135,364			(20,260		)	7,167,565
	Total HTM securities		$	7,321,716	$	(257	)	$	7,321,459	$	136,027		$	(20,260	)	$	7,437,226
	December 31, 2012
	GSE debentures		$	268,996	$	—		$	268,996	$	357		$	—		$	269,353
	MBS and ABS:
	Other U.S. obligations -guaranteed RMBS		3,123,784		—			3,123,784		84,169			(1,345		)	3,206,608
	GSE RMBS		3,859,172		—			3,859,172		155,044			(76		)	4,014,140
	Private-label RMBS		235,778		—			235,778		992			(2,577		)	234,193
	Manufactured housing loan ABS		14,779		—			14,779		—			(2,276		)	12,503
	Home equity loan ABS		2,446		(312		)	2,134		5			(340		)	1,799
	Total MBS and ABS		7,235,959		(312		)	7,235,647		240,210			(6,614		)	7,469,243
	Total HTM securities		$	7,504,955	$	(312	)	$	7,504,643	$	240,567		$	(6,614	)	$	7,738,596
	(1)	Amortized cost includes adjustments made to the cost basis of an investment for accretion, amortization, collection of principal, and, if applicable, OTTI recognized in earnings (credit losses).
	(2)	Carrying value of HTM securities represents amortized cost after adjustment for non-credit OTTI recognized in AOCI.
	(3)	Gross unrecognized holding gains (losses) represents the difference between estimated fair value and carrying value.
	Premiums and Discounts. At September 30, 2013 and December 31, 2012, the amortized cost of our MBS and ABS HTM securities included unamortized purchase premiums and discounts, OTTI credit losses, and OTTI-related accretion adjustments resulting in net premiums of $47,662 and $51,784, respectively.
	Unrealized Loss Positions. The following table presents impaired HTM securities (i.e., in an unrealized loss position), aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position. None of our non-MBS were in an unrealized loss position at September 30, 2013 or December 31, 2012.
			Less than 12 months					12 months or more					Total
			Estimated		Unrealized			Estimated		Unrealized			Estimated			Unrealized
	September 30, 2013		Fair Value		Losses			Fair Value		Losses			Fair Value			Losses (1)
	MBS and ABS:
	Other U.S. obligations - guaranteed RMBS		$	1,415,791	$	(7,734	)	$	435,953	$	(3,759	)	$	1,851,744		$	(11,493	)
	GSE RMBS		1,357,575		(4,805		)	7,590		(23		)	1,365,165			(4,828		)
	Private-label RMBS		48,662		(311		)	64,397		(1,491		)	113,059			(1,802		)
	Manufactured housing loan ABS		—		—			11,399		(2,010		)	11,399			(2,010		)
	Home equity loan ABS		—		—			1,907		(279		)	1,907			(279		)
	Total MBS and ABS		2,822,028		(12,850		)	521,246		(7,562		)	3,343,274			(20,412		)
	Total impaired HTM securities		$	2,822,028	$	(12,850	)	$	521,246	$	(7,562	)	$	3,343,274		$	(20,412	)
	December 31, 2012
	MBS and ABS:
	Other U.S. obligations - guaranteed RMBS		$	274,784	$	(432	)	$	460,152	$	(913	)	$	734,936		$	(1,345	)
	GSE RMBS		124,225		(76		)	—		—			124,225			(76		)
	Private-label RMBS		7,258		(36		)	155,651		(2,541		)	162,909			(2,577		)
	Manufactured housing loan ABS		—		—			12,503		(2,276		)	12,503			(2,276		)
	Home equity loan ABS		—		—			1,799		(647		)	1,799			(647		)
	Total MBS and ABS		406,267		(544		)	630,105		(6,377		)	1,036,372			(6,921		)
	Total impaired HTM securities		$	406,267	$	(544	)	$	630,105	$	(6,377	)	$	1,036,372		$	(6,921	)
	(1)	Total unrealized losses on home equity loan ABS will not agree to total gross unrecognized holding losses. Total unrealized losses include non-credit-related OTTI losses recorded in AOCI and gross unrecognized holding gains on previously OTTI securities.
	Redemption Terms. The amortized cost, carrying value and estimated fair value of non-MBS HTM securities by contractual maturity are presented below. MBS and ABS are not presented by contractual maturity because their actual maturities will likely differ from contractual maturities as certain borrowers have the right to prepay obligations with or without prepayment fees.
			September 30, 2013							December 31, 2012
			Amortized		Carrying			Estimated		Amortized			Carrying			Estimated
	Year of Contractual Maturity		Cost (1)		Value (2)			Fair Value		Cost (1)			Value (2)			Fair Value
	Non-MBS:
	Due in one year or less		$	—	$	—		$	—	$	—		$	—		$	—
	Due after one year through five years		268,998		268,998			269,661		268,996			268,996			269,353
	Due after five years through ten years		—		—			—		—			—			—
	Due after ten years		—		—			—		—			—			—
	Total Non-MBS		268,998		268,998			269,661		268,996			268,996			269,353
	Total MBS and ABS		7,052,718		7,052,461			7,167,565		7,235,959			7,235,647			7,469,243
	Total HTM securities		$	7,321,716	$	7,321,459		$	7,437,226	$	7,504,955		$	7,504,643		$	7,738,596
(1)	Amortized cost includes adjustments made to the cost basis of an investment for accretion, amortization, collection of principal, and, if applicable, OTTI recognized in earnings (credit losses).
(2)	Carrying value of HTM securities represents amortized cost after adjustment for non-credit OTTI recognized in AOCI.

OtherThanTemporary_Impairments

Other-Than-Temporary Impairments Analysis	9 Months Ended
	Sep. 30, 2013
Other Than Temporary Impairments Analysis [Abstract]	'
Other-Than-Temporary-Impairment Analysis	'
	Note 5 - Other-Than-Temporary Impairment Analysis
	OTTI Evaluation Process and Results - Private-label RMBS and ABS. On a quarterly basis, we evaluate for OTTI our individual AFS and HTM securities that have been previously OTTI or are in an unrealized loss position. As part of our evaluation, we consider whether we intend to sell each security and whether it is more likely than not that we will be required to sell the security before its anticipated recovery.
	If either of these conditions is met, we recognize an OTTI loss in earnings equal to the entire difference between the debt security's amortized cost and its estimated fair value as of the Statement of Condition date. For the nine months ended September 30, 2013, we recorded an OTTI credit charge of $1,924, representing the entire difference between our amortized cost basis and its estimated fair value, on one security for which we changed our previous intention to hold until recovery of its amortized cost. We did not have any such change in intent during the three months ended September 30, 2013 or the three and nine months ended September 30, 2012.
	For those securities that meet neither of these conditions, we perform a cash flow analysis to determine whether we expect to recover the entire amortized cost of each security as described in Note 6 - Other-Than-Temporary Impairment Analysis of our 2012 Form 10-K. As a result of our analysis, there were no additional OTTI credit losses recognized for the three and nine months ended September 30, 2013 and we recognized additional credit losses of $14 and $3,594 during the three and nine months ended September 30, 2012, respectively. We determined that the unrealized losses on the remaining private-label RMBS and ABS were temporary as we expect to recover the entire amortized cost.
	The following table presents a rollforward of the amounts related to credit losses recognized in earnings. The rollforward excludes accretion of credit losses for securities that have not experienced a significant increase in cash flows.
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
	Credit Loss Rollforward	2013		2012		2013			2012
	Balance at beginning of period	$	72,287	$	109,214	$	109,169		$	105,636
	Additions:
	Additional credit losses for which OTTI was previously recognized	—		14		1,924			3,594
	Reductions:
	Credit losses on securities sold, matured, paid down or prepaid	—		—		(30,506		)	(2		)
	Unamortized life-to-date credit losses on security that we intend to sell before recovery of its amortized cost basis	—		—		(8,300		)	—
	Balance at end of period	$	72,287	$	109,228	$	72,287		$	109,228
	The following table presents the September 30, 2013 classification and balances of OTTI securities impaired prior to September 30, 2013 (i.e., life to date) but not necessarily as of September 30, 2013. Securities are classified based on the originator's classification at the time of origination or based on the classification by the NRSROs upon issuance. Because there is no universally accepted definition of prime, Alt-A or subprime underwriting standards, such classifications are subjective.
		September 30, 2013
		HTM Securities										AFS Securities
	OTTI Life-to-Date	UPB		Amortized Cost		Carrying Value			Estimated Fair Value			UPB		Amortized Cost		Estimated Fair Value
	Private-label RMBS - prime	$	—	$	—	$	—		$	—		$	539,339	$	470,754	$	488,569
	Private-label RMBS - Alt-A	—		—		—			—			—		—		—
	Home equity loan ABS - subprime	920		884		627			732			—		—		—
	Total OTTI securities	$	920	$	884	$	627		$	732		$	539,339	$	470,754	$	488,569
	OTTI Evaluation Process and Results - All Other AFS and HTM Securities.
	Other U.S. and GSE Obligations and TVA Debentures. For other U.S. obligations, GSE obligations, and TVA debentures, we determined that the strength of the issuers' guarantees through direct obligations of or support from the United States government is sufficient to protect us from any losses based on current expectations. As a result, we have determined that, as of September 30, 2013, all of the gross unrealized losses are temporary.

Advances

Advances	9 Months Ended
	Sep. 30, 2013
Advances [Abstract]	'
Advances	'
	Note 6 - Advances
	We had Advances outstanding, as presented below by year of contractual maturity, with interest rates ranging from 0% to 8.34%.
		September 30, 2013					December 31, 2012
	Year of Contractual Maturity	Amount			WAIR %		Amount			WAIR %
	Overdrawn demand and overnight deposit accounts	$	17		2.5		$	15,004		2.5
	Due in 1 year or less	4,184,443			0.67		3,761,551			1.57
	Due after 1 year through 2 years	2,019,963			2.56		1,365,251			2.66
	Due after 2 years through 3 years	3,832,451			2.4		2,287,033			3.11
	Due after 3 years through 4 years	2,969,219			2.35		3,435,097			2.61
	Due after 4 years through 5 years	2,027,387			2.23		2,448,083			2.22
	Thereafter	3,332,013			2.04		4,070,200			2.49
	Total Advances, par value	18,365,493			1.93		17,382,219			2.38
	Unamortized discounts (including AHP)	(3,220		)			(1,284		)
	Hedging adjustments	323,670					577,225
	Unamortized swap termination fees associated with modified Advances	110,354					171,298
	Total Advances	$	18,796,297				$	18,129,458
	At September 30, 2013 and December 31, 2012, we had $3.7 billion outstanding of Advances that can be prepaid without incurring prepayment or termination fees. All other Advances may only be prepaid by paying a fee (prepayment fee) that is sufficient to make us financially indifferent to the prepayment of the Advance.
	At September 30, 2013 and December 31, 2012, we had putable Advances outstanding totaling $204,000 and $351,500, respectively. We had no convertible Advances outstanding at September 30, 2013 or December 31, 2012.
	The following table presents Advances by the earlier of the year of contractual maturity or the next call date and next put date:
		Year of Contractual Maturity						Year of Contractual Maturity
		or Next Call Date						or Next Put Date
		September 30,			December 31,			September 30,			December 31,
		2013			2012			2013			2012
	Overdrawn demand and overnight deposit accounts	$	17		$	15,004		$	17		$	15,004
	Due in 1 year or less	6,544,808			5,800,961			4,382,443			4,070,551
	Due after 1 year through 2 years	1,996,713			1,348,251			2,010,463			1,327,251
	Due after 2 years through 3 years	3,896,451			2,163,783			3,803,451			2,250,533
	Due after 3 years through 4 years	2,736,469			3,539,097			2,879,719			3,405,097
	Due after 4 years through 5 years	1,812,387			2,310,333			1,977,387			2,328,583
	Thereafter	1,378,648			2,204,790			3,312,013			3,985,200
	Total Advances, par value	$	18,365,493		$	17,382,219		$	18,365,493		$	17,382,219
	Prepayment Fees. When a borrower prepays an Advance, future income will be lower if the principal portion of the prepaid Advance is reinvested in lower-yielding assets that continue to be funded by higher-costing debt. To protect against this risk, we generally charge a prepayment fee. Advance prepayment fees, excluding any associated hedging basis adjustments, at the time of the prepayment were $273 and $31,114 for the three and nine months ended September 30, 2013 compared to $5,067 and $12,737 for the three and nine months ended September 30, 2012, respectively.
	In cases in which we fund a new Advance to the pre-paying borrower concurrent with or within a short period of time before or after the prepayment of an existing Advance and the Advance meets the accounting criteria to qualify as a modification of the prepaid Advance, any prepayment fee, net of hedging basis adjustments, is deferred, recorded in the basis of the modified Advance, and amortized using a level-yield methodology over the life of the modified Advance, or as an adjustment to the interest coupon accrual of the modified Advance. For the three and nine months ended September 30, 2013, we deferred $197 and $12,132, respectively, of these gross Advance prepayment fees, compared to $17,973 and $44,864, respectively, for the three and nine months ended September 30, 2012.
	Credit Risk Exposure and Security Terms. At September 30, 2013 and December 31, 2012, we had a total of $8.0 billion and $8.4 billion, respectively, of Advances outstanding, at par, to single borrowers with balances that were greater than or equal to $1.0 billion. These Advances, representing 44% and 48%, respectively, of total Advances at par outstanding on those dates, were made to four and five borrowers, respectively. At September 30, 2013 and December 31, 2012, we held $15.2 billion and $17.9 billion, respectively, of UPB of collateral to cover the Advances to these borrowers.
	See Note 8 - Allowance for Credit Losses for information related to credit risk on Advances and allowance methodology for credit losses.

Mortgage_Loans_Held_for_Portfo

Mortgage Loans Held for Portfolio	9 Months Ended
	Sep. 30, 2013
Mortgage Loans on Real Estate [Abstract]	'
Mortgage Loans Held for Portfolio	'
	Note 7 - Mortgage Loans Held for Portfolio
	The following tables present information on Mortgage Loans Held for Portfolio:
			September 30, 2013
	By Term		MPP			MPF			Total
	Fixed-rate medium-term (1) mortgages		$	1,026,871		$	82,947		$	1,109,818
	Fixed-rate long-term (2) mortgages		4,519,256			432,299			4,951,555
	Total Mortgage Loans Held for Portfolio, UPB		5,546,127			515,246			6,061,373
	Unamortized premiums		102,325			10,536			112,861
	Unamortized discounts		(12,187		)	(114		)	(12,301		)
	Hedging adjustments		3,891			(677		)	3,214
	Allowance for loan losses		(5,000		)	(500		)	(5,500		)
	Total Mortgage Loans Held for Portfolio, net		$	5,635,156		$	524,491		$	6,159,647
			December 31, 2012
	By Term		MPP			MPF			Total
	Fixed-rate medium-term (1) mortgages		$	960,944		$	41,014		$	1,001,958
	Fixed-rate long-term (2) mortgages		4,735,020			189,166			4,924,186
	Total Mortgage Loans Held for Portfolio, UPB		5,695,964			230,180			5,926,144
	Unamortized premiums		81,459			6,323			87,782
	Unamortized discounts		(12,266		)	—			(12,266		)
	Hedging adjustments		8,859			886			9,745
	Allowance for loan losses		(9,850		)	(150		)	(10,000		)
	Total Mortgage Loans Held for Portfolio, net		$	5,764,166		$	237,239		$	6,001,405
	(1)	Medium-term is defined as a term of 15 years or less at origination.
	(2)	Long-term is defined as a term greater than 15 years at origination.
			September 30, 2013
	By Type		MPP			MPF			Total
	Conventional		$	4,786,021		$	412,634		$	5,198,655
	Government		760,106			102,612			862,718
	Total Mortgage Loans Held for Portfolio, UPB		$	5,546,127		$	515,246		$	6,061,373
			December 31, 2012
	By Type		MPP			MPF			Total
	Conventional		$	4,810,269		$	177,204		$	4,987,473
	Government		885,695			52,976			938,671
	Total Mortgage Loans Held for Portfolio, UPB		$	5,695,964		$	230,180		$	5,926,144
	For information related to our credit risk on mortgage loans and allowance for credit losses, see Note 8 - Allowance for Credit Losses.

Allowance_for_Credit_Losses

Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2013
Allowance for Credit Losses [Abstract]	'
Allowance for Credit Losses	'
	Note 8 - Allowance for Credit Losses
	We have established an allowance methodology for each of our portfolio segments: credit products (Advances, letters of credit, and other extensions of credit to members); term securities purchased under agreements to resell; term federal funds sold; government-guaranteed or insured Mortgage Loans Held for Portfolio; and conventional Mortgage Loans Held for Portfolio. A description of the allowance methodologies related to our portfolio segments is disclosed in Note 9 - Allowance for Credit Losses in our 2012 Form 10-K.
	Credit Products. Using a risk-based approach, we consider the amount and quality of the collateral pledged and the borrower's financial condition to be indicators of credit quality on the borrower's credit products. At September 30, 2013 and December 31, 2012, we had rights to collateral on a member-by-member basis with an estimated value in excess of our outstanding extensions of credit.
	At September 30, 2013 and December 31, 2012, we did not have any credit products that were past due, on non-accrual status, or considered impaired.
	Based upon the collateral held as security, our credit extension and collateral policies, our credit analysis and the repayment history on credit products, we have not recorded any allowance for credit losses on credit products. At September 30, 2013 and December 31, 2012, no liability to reflect an allowance for credit losses for off-balance sheet credit exposures was recorded. For additional information about off-balance sheet credit exposure, see Note 18 - Commitments and Contingencies.
	Mortgage Loans.
	Credit Enhancements.
	MPP Credit Enhancements. Our allowance for loan losses considers the credit enhancements associated with conventional mortgage loans under the MPP, which includes the original program and MPP Advantage. Any estimated losses that would be recovered from the credit enhancements are not reserved for as part of our allowance for loan losses. However, as part of the estimate of the recoverable credit enhancements, we evaluate the recovery and collectability related to our PMI/SMI policies. As a result of our evaluation, we reduced our estimates of recovery associated with the expected amount of our claims for all providers of these policies and established an allowance for unrecoverable PMI/SMI at September 30, 2013 and December 31, 2012 of $1,685 and $6,067, respectively, as a component of the allowance for MPP loan losses. This decrease in the allowance for unrecoverable PMI/SMI substantially comprised the reduction in our allowance for credit losses from December 31, 2012 to September 30, 2013.
	The credit enhancements are applied to the estimated losses after any remaining borrower's equity in the following order: any applicable PMI up to coverage limits, any available funds remaining in the LRA up to each master commitment contract's allocated share, and any SMI coverage (not applicable to the MPP Advantage) up to the policy limits. Since we would bear any remaining loss, an estimate of the remaining loss is included in our allowance for loan losses.
	The following table presents the impact of credit enhancements on the allowance:
	MPP Credit Waterfall		September 30,			December 31,
			2013			2012
	Estimated losses remaining after borrower's equity, before credit enhancements		$	35,963		$	51,465
	Portion of estimated losses recoverable from PMI		(4,977		)	(6,494		)
	Portion of estimated losses recoverable from LRA		(5,216		)	(7,750		)
	Portion of estimated losses recoverable from SMI		(22,455		)	(33,438		)
	Allowance for unrecoverable PMI/SMI		1,685			6,067
	Allowance for MPP loan losses		$	5,000		$	9,850
	The following table presents the activity in the LRA:
			Nine Months Ended September 30,
	LRA Activity		2013			2012
	Balance of LRA, beginning of period		$	33,693		$	23,408
	Additions		12,555			13,017
	Claims paid		(2,422		)	(6,165		)
	Distributions		(761		)	(634		)
	Balance of LRA, end of period		$	43,065		$	29,626
	MPF Credit Enhancements. The following table presents the activity related to MPF Credit Enhancements:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	MPF CE Fees		2013			2012			2013			2012
	Gross CE Fees paid to PFIs		$	90		$	1		$	207		$	1
	Performance-based CE Fees recovered from PFIs		—			—			—			—
	Net CE Fees paid		$	90		$	1		$	207		$	1
	If losses occur in a master commitment, these losses will either be: (i) recovered through the withholding of future performance-based CE Fees from the PFI or (ii) absorbed by us in the FLA. As of September 30, 2013 and December 31, 2012, our exposure under the FLA was $3,104 and $1,157, respectively, with CE Obligations available to cover losses in excess of the FLA totaling $24,429 and $8,607, respectively. Any estimated losses that would be absorbed by the CE Obligation are not reserved for as part of our allowance for loan losses. Accordingly, the calculated allowance was reduced by $153 and $67 as of September 30, 2013 and December 31, 2012, respectively, for the amount in excess of the FLA to be covered by PFIs’ CE Obligations. The resulting allowance for MPF loan losses at September 30, 2013 and December 31, 2012 was $500 and $150, respectively.
	Allowance for Loan Losses on Mortgage Loans. The tables below present a rollforward of our allowance for loan losses on mortgage loans, the allowance for loan losses by impairment methodology, and the recorded investment in mortgage loans by impairment methodology. The recorded investment in a loan is the UPB of the loan, adjusted for accrued interest, net of deferred loan fees or costs, unamortized premiums or discounts (which may include the basis adjustment related to any gain or loss on a delivery commitment prior to being funded) and direct write-downs. The recorded investment is not net of any valuation allowance.
			MPP			MPF
	Rollforward of Allowance		Conventional			Conventional			Total
	Allowance for loan losses on mortgage loans, June 30, 2013		$	5,000		$	500		$	5,500
	Charge-offs		(314		)	—			(314		)
	Provision for (Reversal of) loan losses		314			—			314
	Allowance for loan losses on mortgage loans, September 30, 2013		$	5,000		$	500		$	5,500
	Allowance for loan losses on mortgage loans, December 31, 2012		$	9,850		$	150		$	10,000
	Charge-offs		(1,049		)	—			(1,049		)
	Provision for (Reversal of) for loan losses		(3,801		)	350			(3,451		)
	Allowance for loan losses on mortgage loans, September 30, 2013		$	5,000		$	500		$	5,500
	Allowance for loan losses on mortgage loans, June 30, 2012		$	5,000		$	—		$	5,000
	Charge-offs		(634		)	—			(634		)
	Provision for (Reversal of) loan losses		5,609			25			5,634
	Allowance for loan losses on mortgage loans, September 30, 2012		$	9,975		$	25		$	10,000
	Allowance for loan losses on mortgage loans, December 31, 2011		$	3,300		$	—		$	3,300
	Charge-offs		(1,217		)	—			(1,217		)
	Provision for (Reversal of) for loan losses		7,892			25			7,917
	Allowance for loan losses on mortgage loans, September 30, 2012		$	9,975		$	25		$	10,000
			MPP			MPF
	Allowance for Loan Losses, September 30, 2013		Conventional			Conventional			Total
	Loans collectively evaluated for impairment		$	4,252		$	500		$	4,752
	Loans individually evaluated for impairment (1)		748			—			748
	Total allowance for loan losses		$	5,000		$	500		$	5,500
	Allowance for Loan Losses, December 31, 2012
	Loans collectively evaluated for impairment		$	8,814		$	150		$	8,964
	Loans individually evaluated for impairment (1)		1,036			—			1,036
	Total allowance for loan losses		$	9,850		$	150		$	10,000
	Recorded Investment, September 30, 2013
Loans collectively evaluated for impairment		$	4,860,122		$	422,681		$	5,282,803
Loans individually evaluated for impairment (1)		18,530			—			18,530
Total recorded investment		$	4,878,652		$	422,681		$	5,301,333
Recorded Investment, December 31, 2012
Loans collectively evaluated for impairment		$	4,871,579		$	183,399		$	5,054,978
Loans individually evaluated for impairment (1)		16,817			—			16,817
Total recorded investment		$	4,888,396		$	183,399		$	5,071,795
(1)	The recorded investment in our MPP conventional loans individually evaluated for impairment excludes potential claims by servicers as of September 30, 2013 and December 31, 2012 for any losses resulting from past or future liquidations of the underlying properties on $11,195 and $15,665, respectively, of principal that was previously paid in full by the servicers. However, the MPP conventional loan allowance for loan losses includes $690 and $968 for these potential claims as of September 30, 2013 and December 31, 2012, respectively.
Credit Quality Indicators. The tables below present our key credit quality indicators for mortgage loans at September 30, 2013 and December 31, 2012:
		MPP						MPF
Mortgage Loans Held for Portfolio as of September 30, 2013		Conventional			FHA			Conventional			Government			Total
Past due 30-59 days		$	57,900		$	27,876		$	229		$	832		$	86,837
Past due 60-89 days		17,743			8,873			—			166			26,782
Past due 90 days or more		85,766			3,502			129			253			89,650
Total past due		161,409			40,251			358			1,251			203,269
Total current		4,717,243			742,455			422,323			103,301			5,985,322
Total mortgage loans, recorded investment		4,878,652			782,706			422,681			104,552			6,188,591
Net unamortized premiums		(71,190		)	(18,948		)	(8,930		)	(1,492		)	(100,560		)
Hedging adjustments		(3,101		)	(791		)	713			(35		)	(3,214		)
Accrued interest receivable		(18,340		)	(2,861		)	(1,830		)	(413		)	(23,444		)
Total Mortgage Loans Held for Portfolio, UPB		$	4,786,021		$	760,106		$	412,634		$	102,612		$	6,061,373
Other Delinquency Statistics as of September 30, 2013
In process of foreclosure, included above (1)		$	52,541		$	—		$	—		$	—		$	52,541
Serious delinquency rate (2)		1.76		%	0.45		%	0.03		%	0.24		%	1.45		%
Past due 90 days or more still accruing interest (3)		$	85,363		$	3,502		$	—		$	253		$	89,118
On non-accrual status		1,355			—			129			—			1,484
		MPP						MPF
Mortgage Loans Held for Portfolio as of December 31, 2012		Conventional			FHA			Conventional			Government			Total
Past due 30-59 days		$	63,797		$	36,522		$	293		$	78		$	100,690
Past due 60-89 days		25,050			8,761			—			36			33,847
Past due 90 days or more		104,984			3,440			1			—			108,425
Total past due		193,831			48,723			294			114			242,962
Total current		4,694,565			859,236			183,105			54,649			5,791,555
Total mortgage loans, recorded investment		4,888,396			907,959			183,399			54,763			6,034,517
Net unamortized premiums		(51,202		)	(17,990		)	(4,790		)	(1,534		)	(75,516		)
Hedging adjustments		(7,958		)	(901		)	(819		)	(67		)	(9,745		)
Accrued interest receivable		(18,967		)	(3,373		)	(586		)	(186		)	(23,112		)
Total Mortgage Loans Held for Portfolio, UPB		$	4,810,269		$	885,695		$	177,204		$	52,976		$	5,926,144
Other Delinquency Statistics as of December 31, 2012
In process of foreclosure, included above (1)		$	75,317		$	—		$	—		$	—		$	75,317
Serious delinquency rate (2)		2.15		%	0.38		%	—		%	—		%	1.8		%
Past due 90 days or more still accruing interest (3)		$	104,805		$	3,440		$	1		$	—		$	108,246
On non-accrual status		1,816			—			—			—			1,816
(1)	Includes loans for which the decision of foreclosure or similar alternative, such as pursuit of deed-in-lieu of foreclosure, has been reported. Loans in process of foreclosure are included in past due categories depending on their delinquency status.
(2)	Represents loans 90 days or more past due (including loans in process of foreclosure) expressed as a percentage of the total recorded investment in mortgage loans. The percentage excludes principal amounts that were previously paid in full by the servicers on conventional loans that are pending resolution of potential loss claims. Many FHA loans are repurchased by the servicers when they reach 90 days or more delinquent status, similar to the rules for servicers of Ginnie Mae MBS, resulting in the lower serious delinquency rate for FHA loans.
(3)	Although our past due scheduled/scheduled MPP loans are classified as loans past due 90 days or more based on the mortgagor's payment status, we do not consider these loans to be non-accrual.
Troubled Debt Restructurings. The table below presents the recorded investment of the performing and non-performing troubled debt restructurings.
		September 30, 2013									December 31, 2012
Recorded Investment		Performing			Non-Performing (1)			Total			Performing			Non-Performing (1)			Total
MPP conventional loans		$	17,389		$	1,141		$	18,530		$	15,001		$	1,816		$	16,817
(1)	Represents loans on non-accrual status only.
The tables below present the financial effect of the troubled debt restructurings for the three and nine months ended September 30, 2013 and 2012. The pre- and post-modification amounts represent the amount of recorded investment as of the date the loans were modified.
		Three Months Ended						Nine Months Ended
		September 30, 2013						September 30, 2013
Troubled Debt Restructurings at Modification Date		Pre-Modification			Post-Modification (1)			Pre-Modification			Post-Modification (1)
MPP conventional loans		$	767		$	802		$	4,060		$	4,306
		Three Months Ended						Nine Months Ended
		September 30, 2012						September 30, 2012
Troubled Debt Restructurings at Modification Date		Pre-Modification			Post-Modification (1)			Pre-Modification			Post-Modification (1)
MPP conventional loans		$	2,163		$	2,325		$	11,931		$	12,843
(1)	Includes the capitalization of interest previously received under scheduled/scheduled payment terms.
During the three and nine months ended September 30, 2013 and 2012, certain conventional MPP loans classified as troubled debt restructurings within the previous 12 months experienced a payment default. A borrower is considered to have defaulted on a troubled debt restructuring if the borrower's contractually due principal or interest is 60 days or more past due at any time during the period presented. The recorded investment of certain conventional MPP loans classified as troubled debt restructurings within the previous 12 months that experienced a payment default was $366 and $911 for the three and nine months ended September 30, 2013, respectively, compared to $1,013 and $3,751 for the three and nine months ended September 30, 2012, respectively. For purposes of this disclosure, only the initial default was included; however, a loan can experience another payment default in a subsequent period.
A loan considered to be a troubled debt restructuring is individually evaluated for impairment when determining its related allowance for loan loss. The tables below present the impaired conventional loans individually evaluated for impairment as of September 30, 2013 and December 31, 2012. The first table presents the recorded investment, UPB and related allowance associated with these loans while the next tables present the average recorded investment of individually impaired loans and related interest income recognized.
		September 30, 2013									December 31, 2012
Individually Evaluated Impaired Loans		Recorded Investment			UPB			Related Allowance for Loan Losses			Recorded Investment			UPB			Related Allowance for Loan Losses
MPP conventional loans without allowance for loan losses		$	17,389		$	17,222		$	—		$	15,001		$	14,892		$	—
MPP conventional loans with allowance for loan losses		1,141			1,116			58			1,816			1,783			68
Total		$	18,530		$	18,338		$	58		$	16,817		$	16,675		$	68
		Three Months Ended						Nine Months Ended
		September 30, 2013						September 30, 2013
Individually Evaluated Impaired Loans		Average Recorded Investment			Interest Income Recognized			Average Recorded Investment			Interest Income Recognized
MPP conventional loans without allowance for loan losses		$	17,447		$	253		$	16,396		$	708
MPP conventional loans with allowance for loan losses		1,143			17			1,142			82
Total		$	18,590		$	270		$	17,538		$	790
		Three Months Ended						Nine Months Ended
		September 30, 2012						September 30, 2012
Individually Evaluated Impaired Loans		Average Recorded Investment			Interest Income Recognized			Average Recorded Investment			Interest Income Recognized
MPP conventional loans without allowance for loan losses		$	11,438		$	182		$	6,975		$	377
MPP conventional loans with allowance for loan losses		2,404			35			1,519			79
Total		$	13,842		$	217		$	8,494		$	456

Derivative_and_Hedging_Activit

Derivative and Hedging Activities	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments and Hedging Activities	'
	Note 9 - Derivatives and Hedging Activities
	Financial Statement Effect and Additional Financial Information. The following table presents the notional amount and estimated fair value of derivative instruments. Over-the-counter derivative transactions may be either executed with a counterparty (bilateral derivatives) or cleared through a Futures Commission Merchant (i.e., clearing agent) with a Clearinghouse (cleared derivatives). Once a derivative transaction has been accepted for clearing by a Clearinghouse, the derivative transaction is novated and the executing counterparty is replaced with the Clearinghouse. The Clearinghouse notifies the clearing agent of the required initial and variation margin, and the clearing agent notifies us of the required initial and variation margin. For purposes of this disclosure, the derivative values include the related accrued interest.
			Notional Amount of Derivatives			Estimated Fair Value of			Estimated Fair Value of
						Derivative Assets			Derivative Liabilities
	September 30, 2013
	Derivatives designated as hedging instruments:
	Interest-rate swaps (1)		$	31,866,210		$	112,380		$	688,543
	Total derivatives designated as hedging instruments		31,866,210			112,380			688,543
	Derivatives not designated as hedging instruments:
	Interest-rate swaps		1,859,743			792			339
	Interest-rate caps/floors		340,500			1,194			—
	Interest-rate futures/forwards		104,300			—			2,479
	MDCs		101,983			1,247			—
	Total derivatives not designated as hedging instruments		2,406,526			3,233			2,818
	Total derivatives before adjustments		$	34,272,736		115,613			691,361
	Netting adjustments					(114,366		)	(114,366		)
	Cash collateral and related accrued interest					6,408			(389,761		)
	Total adjustments (2)					(107,958		)	(504,127		)
	Total derivatives, net					$	7,655		$	187,234
	December 31, 2012
	Derivatives designated as hedging instruments:
	Interest-rate swaps		$	32,158,474		$	71,297		$	951,216
	Total derivatives designated as hedging instruments		32,158,474			71,297			951,216
	Derivatives not designated as hedging instruments:
	Interest-rate swaps		1,214,179			757			233
	Interest-rate caps/floors		340,500			1,005			—
	Interest-rate futures/forwards		156,700			230			43
	MDCs		157,475			289			29
	Total derivatives not designated as hedging instruments		1,868,854			2,281			305
	Total derivatives before adjustments		$	34,027,328		73,578			951,521
	Netting adjustments					(72,757		)	(72,757		)
	Cash collateral and related accrued interest					—			(677,649		)
	Total adjustments (2)					(72,757		)	(750,406		)
	Total derivatives, net					$	821		$	201,115
	(1)	Includes all cleared derivatives.
	(2)	Amounts represent the application of the netting requirements that allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing agent and/or counterparty.
	We record derivative instruments, related cash collateral, including initial and variation margin, received or pledged and associated accrued interest, on a net basis by clearing agent and/or by counterparty when we have met the netting requirements. The following table presents separately the estimated fair value of derivative instruments meeting or not meeting netting requirements, including the related collateral received from or pledged to counterparties.
	30-Sep-13		Estimated Fair Value of Derivative Assets			Estimated Fair Value of Derivative Liabilities
	Derivative instruments meeting netting requirements:
	Gross recognized amount
	Bilateral derivatives		$	113,128		$	686,087
	Cleared derivatives		1,238			2,795
	Total gross recognized amount		114,366			688,882
	Gross amounts of netting adjustments and cash collateral
	Bilateral derivatives		(113,128		)	(501,332		)
	Cleared derivatives		5,170			(2,795		)
	Total gross amounts of netting adjustments and cash collateral		(107,958		)	(504,127		)
	Net amounts after netting adjustments and cash collateral
	Bilateral derivatives		—			184,755
	Cleared derivatives		6,408			—
	Total net amounts after netting adjustments and cash collateral		6,408			184,755
	Derivative instruments not meeting netting requirements (1)		1,247			2,479
	Total derivatives		$	7,655		$	187,234
	31-Dec-12		Estimated Fair Value of Derivative Assets			Estimated Fair Value of Derivative Liabilities
	Derivative instruments meeting netting requirements:
	Gross recognized amount		$	73,059		$	951,449
	Gross amounts of netting adjustments and cash collateral		(72,757		)	(750,406		)
	Net amounts after netting adjustments and cash collateral		302			201,043
	Derivative instruments not meeting netting requirements (1)		519			72
	Total derivatives		$	821		$	201,115
	(1)	Includes MDCs and certain interest-rate futures or forwards.
	The following table presents the components of Net Gains (Losses) on Derivatives and Hedging Activities reported in Other Income (Loss):
			Three Months Ended September 30,						Nine Months Ended September 30,
Type of Hedge		2013			2012			2013			2012
Net gain (loss) related to fair-value hedge ineffectiveness:
Interest-rate swaps		$	(1,353	)	$	(1,973	)	$	8,596		$	(2,425	)
Total net gain (loss) related to fair-value hedge ineffectiveness		(1,353		)	(1,973		)	8,596			(2,425		)
Net gain (loss) on derivatives not designated as hedging instruments:
Economic hedges:
Interest-rate swaps		62			91			5,002			294
Interest-rate caps/floors		(405		)	(301		)	189			(1,577		)
Interest-rate futures/forwards		334			(6,054		)	6,119			(10,602		)
Net interest settlements		194			(41		)	(4,063		)	(47		)
MDCs		1,043			5,222			(5,172		)	6,914
Total net gain (loss) on derivatives not designated as hedging instruments		1,228			(1,083		)	2,075			(5,018		)
Net Gains (Losses) on Derivatives and Hedging Activities		$	(125	)	$	(3,056	)	$	10,671		$	(7,443	)
The following table presents, by type of hedged item, the gains (losses) on derivatives and the related hedged items in fair-value hedging relationships and the effect of those derivatives on Net Interest Income:
		Gain (Loss)			Gain (Loss)			Net Fair-				Effect on
		on			on Hedged			Value Hedge				Net Interest
Three Months Ended September 30, 2013		Derivative			Item			Ineffectiveness				Income (1)
Advances		$	(8,893	)	$	7,160		$	(1,733	)		$	(50,849	)
AFS securities		3,694			(3,524		)	170				(21,524		)
CO Bonds		15,723			(15,513		)	210				21,904
Total		$	10,524		$	(11,877	)	$	(1,353	)		$	(50,469	)
Three Months Ended September 30, 2012
Advances		$	(18,727	)	$	17,638		$	(1,089	)		$	(58,171	)
AFS securities		(15,789		)	16,087			298				(20,157		)
CO Bonds		7,182			(8,364		)	(1,182		)		12,570
Total		$	(27,334	)	$	25,361		$	(1,973	)		$	(65,758	)
Nine Months Ended September 30, 2013
Advances		$	197,316		$	(194,821	)	$	2,495			$	(160,667	)
AFS securities		124,730			(122,879		)	1,851				(64,457		)
CO Bonds		(97,336		)	101,586			4,250				67,238
Total		$	224,710		$	(216,114	)	$	8,596			$	(157,886	)
Nine Months Ended September 30, 2012
Advances		$	(50,374	)	$	48,256		$	(2,118	)		$	(178,514	)
AFS securities		(36,273		)	37,519			1,246				(55,995		)
CO Bonds		19,118			(20,671		)	(1,553		)		42,397
Total		$	(67,529	)	$	65,104		$	(2,425	)		$	(192,112	)
(1)	The net interest on derivatives in fair-value hedging relationships is recorded in the Interest Income / Interest Expense line item of the respective hedged item, which results in fully offsetting amounts, except to the extent of any hedge ineffectiveness.
Managing Credit Risk on Derivatives. We are subject to credit risk due to the risk of nonperformance by the counterparties to our derivative transactions. We manage counterparty credit risk through credit analysis, collateral requirements and adherence to the requirements set forth in our policies, United States Commodity Futures Trading Commission regulations, and Finance Agency regulations.
For bilateral derivatives, the degree of credit risk depends on the extent to which master netting arrangements are included in such contracts to mitigate the risk. We require collateral agreements with collateral delivery thresholds on the majority of our bilateral derivatives. Additionally, collateral related to derivatives with member institutions includes collateral assigned to us, as evidenced by a written security agreement and held by the member institution for our benefit.
For cleared derivatives, the Clearinghouse is our counterparty and, therefore, our credit risk exposure is with a central counterparty rather than individual counterparties. Collateral is required to be posted daily for changes in the value of cleared derivatives to mitigate each counterparty's credit risk. The additional requirement that we post initial and variation margin through the clearing agent, for the benefit of the Clearinghouse, exposes us to institutional credit risk in the event that the clearing agent or Clearinghouse fails to meet its obligations. We have analyzed the enforceability of offsetting rights incorporated in our cleared derivative transactions and determined that the exercise of those offsetting rights by a non-defaulting party under these transactions should be upheld under applicable law upon an event of default including bankruptcy, insolvency or similar proceeding involving the Clearinghouse or our clearing agent, or both. Based on this analysis, we present a net derivative receivable or payable for all transactions through a particular clearing agent with a particular Clearinghouse.
See Note 17 - Estimated Fair Values for discussion regarding our fair value methodology for derivative assets and liabilities, including an evaluation of the potential for the estimated fair value of these instruments to be affected by counterparty credit risk.
We have credit support agreements for our bilateral derivatives that contain provisions requiring us to post additional collateral with our counterparties if there is deterioration in our credit rating. If our credit rating is lowered by an NRSRO, we could be required to deliver additional collateral on bilateral derivative instruments in net liability positions. The aggregate estimated fair value of all bilateral derivative instruments with credit-risk-related contingent features that were in a net liability position (before cash collateral and related accrued interest on cash collateral) at September 30, 2013 was $572,958 for which we have posted collateral, including accrued interest, with an estimated fair value of $389,004 in the normal course of business. In addition, we held other derivative instruments in a net liability position of $2,479 that are not subject to credit support agreements containing credit-risk related contingent features. If our credit rating had been lowered by an NRSRO (from an S&P equivalent of AA+ to AA), we could have been required to deliver up to an additional $41,304 of collateral (at estimated fair value) to our derivative counterparties at September 30, 2013.

Deposits

Deposits	9 Months Ended
	Sep. 30, 2013
Deposits [Abstract]	'
Deposits	'
	Note 10 - Deposits
	The following table presents Interest-Bearing and Non-Interest-Bearing Deposits:
	Type of Deposits		September 30,		December 31,
			2013		2012
	Interest-Bearing:
	Demand and overnight		$	834,605	$	704,216
	Time		3,000		2,250
	Other		22		22
	Total Interest-Bearing		837,627		706,488
	Non-Interest-Bearing:
	Demand (1)		254,601		1,066,041
	Other (2)		22,281		14,622
	Total Non-Interest Bearing		276,882		1,080,663
	Total Deposits		$	1,114,509	$	1,787,151
	(1)	Represents principal and interest custodial accounts transferred to our Bank by a member for GSE remittance payments.
	(2)	Includes pass-through deposit reserves from members.

Consolidated_Obligations

Consolidated Obligations	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Consolidated Obligations	'
	Note 11 - Consolidated Obligations
	As provided by the Bank Act and applicable regulations, Consolidated Obligations are backed only by the financial resources of all 12 FHLBanks. Although we are primarily liable for our portion of Consolidated Obligations (i.e., those issued on our behalf), we are also jointly and severally liable with the other 11 FHLBanks for the payment of the principal and interest on all Consolidated Obligations of each of the FHLBanks. No FHLBank has ever been asked or required to repay the principal or interest on any Consolidated Obligation on behalf of another FHLBank, and we do not believe that it is probable that we will be asked to do so. The par values of the 12 FHLBanks' outstanding Consolidated Obligations totaled $720.7 billion and $687.9 billion at September 30, 2013 and December 31, 2012, respectively.
	Discount Notes. Our participation in Discount Notes, all of which are due within one year of issuance, was as follows:
	Discount Notes	September 30,			December 31,
		2013			2012
	Book value	$	7,804,773		$	8,924,085
	Par value	7,806,128			8,925,828
	Weighted average effective interest rate	0.1		%	0.15		%
	CO Bonds. The following table presents our participation in CO Bonds outstanding:
		September 30, 2013						December 31, 2012
	Year of Contractual Maturity	Amount			WAIR%			Amount			WAIR%
	Due in 1 year or less	$	11,933,250		0.45			$	14,083,675		0.54
	Due after 1 year through 2 years	2,863,950			1.41			2,984,650			1.49
	Due after 2 years through 3 years	1,695,250			1.59			1,323,800			1.59
	Due after 3 years through 4 years	1,356,350			1.6			724,900			3.08
	Due after 4 years through 5 years	1,985,000			2.04			1,337,700			2.29
	Thereafter	7,821,800			2.86			6,881,450			3.11
	Total CO Bonds, par value	27,655,600			1.47			27,336,175			1.5
	Unamortized premiums	35,136						36,958
	Unamortized discounts	(16,188		)				(17,444		)
	Hedging adjustments	(51,428		)				51,841
	Total CO Bonds	$	27,623,120					$	27,407,530
	The following tables present our participation in CO Bonds outstanding by redemption feature and contractual maturity or next call date:
	Redemption Feature	September 30,			December 31,
		2013			2012
	Non-callable / non-putable	$	18,129,600		$	19,952,175
	Callable	9,526,000			7,384,000
	Total CO Bonds, par value	$	27,655,600		$	27,336,175
	Year of Contractual Maturity or Next Call Date	September 30,			December 31,
		2013			2012
	Due in 1 year or less	$	21,394,250		$	21,097,675
	Due after 1 year through 2 years	1,888,950			1,694,650
	Due after 2 years through 3 years	1,087,250			1,091,800
	Due after 3 years through 4 years	440,350			513,900
	Due after 4 years through 5 years	545,000			607,700
	Thereafter	2,299,800			2,330,450
	Total CO Bonds, par value	$	27,655,600		$	27,336,175

Affordable_Housing_Program

Affordable Housing Program	9 Months Ended
	Sep. 30, 2013
Affordable Housing Program [Abstract]	'
Affordable Housing Program	'
	Note 12 - Affordable Housing Program
	The following table summarizes the activity in our AHP funding obligation:
			Three Months Ended September 30,						Nine Months Ended September 30,
	AHP Activity		2013			2012			2013			2012
	Balance at beginning of period		$	41,050		$	34,550		$	34,362		$	32,845
	Assessment (expense)		3,442			4,056			16,066			13,157
	Subsidy usage, net (1)		(4,718		)	(4,059		)	(10,654		)	(11,455		)
	Balance at end of period		$	39,774		$	34,547		$	39,774		$	34,547
	(1)	Subsidies disbursed are reported net of returns of previously disbursed subsidies.

Capital

Capital	9 Months Ended
	Sep. 30, 2013
Capital [Abstract]	'
Capital	'
	Note 13 - Capital
	We are subject to capital requirements under our capital plan and the Finance Agency rules and regulations as disclosed in Note 15 - Capital in our 2012 Form 10-K. As presented in the following table, we were in compliance with the Finance Agency's capital requirements at September 30, 2013 and December 31, 2012. For regulatory purposes, AOCI is not considered capital; MRCS, however, is considered capital.
		September 30, 2013						December 31, 2012
	Regulatory Capital Requirements	Required			Actual			Required			Actual
	Risk-based capital	$	743,626		$	2,625,924		$	636,022		$	2,676,616
	Regulatory permanent capital-to-asset ratio	4		%	6.64		%	4		%	6.49		%
	Regulatory permanent capital	$	1,583,073		$	2,625,924		$	1,649,105		$	2,676,616
	Leverage ratio	5		%	9.95		%	5		%	9.74		%
	Leverage capital	$	1,978,842		$	3,938,886		$	2,061,382		$	4,014,924
	Mandatorily Redeemable Capital Stock. At September 30, 2013 and December 31, 2012, we had $255,319 and $450,716, respectively, in capital stock subject to mandatory redemption, which is classified as a liability in the Statement of Condition.
	The following table presents the activity in MRCS:
		Three Months Ended September 30,						Nine Months Ended September 30,
	MRCS Activity	2013			2012			2013			2012
	Balance at beginning of period	$	255,720		$	450,898		$	450,716		$	453,885
	Additions due to change in membership status	—			—			95,441			3,513
	Redemptions/repurchases	(401		)	(182		)	(290,975		)	(6,709		)
	Accrued dividends	—			—			137			27
	Balance at end of period	$	255,319		$	450,716		$	255,319		$	450,716
	There were 17 and 27 former members holding MRCS at September 30, 2013 and December 31, 2012, respectively, which include zero and eight institutions, respectively, that were members at the time of their acquisition by the FDIC in its capacity as receiver. During the nine months ended September 30, 2013, we repurchased MRCS of $614 pursuant to our statutory and contractual lien on excess capital stock owned by a former member in order to enforce our contractual rights under our MPP and our Advances, Pledge and Security Agreement regarding mortgage loans sold to us. During the nine months ended September 30, 2013, we repurchased $250,000 par value of excess stock held as of December 31, 2012 by shareholders that are former members (or their successors-in-interest). We redeemed an additional $40,975 of excess stock held by former members because the stock had reached the end of its five-year redemption period. See Note 20 - Subsequent Events for details regarding an additional repurchase.
	The following table presents the amount of MRCS by contractual year of redemption. The year of redemption in the table is the later of the end of the five-year redemption period or the maturity date of the activity to which the stock is related, if the stock represents the activity-based stock purchase requirement of a non-member (a former member that withdrew from membership, merged into a non-member or was otherwise acquired by a non-member).
	Contractual Year of Redemption	September 30,			December 31,
		2013			2012
	Year 1	$	147,130		$	268,512
	Year 2	502			144,644
	Year 3	8,733			20,511
	Year 4	3,513			13,536
	Year 5	95,441			3,513
	Total MRCS	$	255,319		$	450,716
	The following table presents the distributions on MRCS:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
	MRCS Distributions	2013			2012			2013			2012
	Recorded as Interest Expense	$	2,225		$	3,355		$	6,713		$	10,592
	Recorded as distributions from Retained Earnings	—			—			137			27
	Total	$	2,225		$	3,355		$	6,850		$	10,619
	Excess Capital Stock. Excess capital stock is defined as the amount of stock held by a member or former member in excess of that institution's minimum stock requirement. Finance Agency rules limit the ability of an FHLBank to create member excess stock under certain circumstances, including if excess stock exceeds 1% of Total Assets or if the issuance of excess stock would cause excess stock to exceed 1% of Total Assets. Our excess stock totaled $733,988 at September 30, 2013, which equaled approximately 1.9% of our Total Assets. Therefore, we are currently not permitted to issue new excess stock to members or distribute stock dividends.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Abstract]	'
Accumulated Other Comprehensive Income (Loss)	'
	Note 14 - Accumulated Other Comprehensive Income (Loss)
	The following table presents a summary of the changes in the components of AOCI for the three and nine months ended September 30, 2013 and 2012:
	AOCI Rollforward	Unrealized Gains (Losses) on AFS Securities (Note 3)			Non-Credit OTTI on AFS Securities (Note 3)			Non-Credit OTTI on HTM Securities			Pension Benefits			Total AOCI
								(Note 4)			(Note 15)
	Balance, June 30, 2012	$	9,895		$	(79,157	)	$	(350	)	$	(10,098	)	$	(79,710	)
	Total Other Comprehensive Income (Loss)	3,606			35,626			18			(570		)	38,680
	Balance, September 30, 2012	$	13,501		$	(43,531	)	$	(332	)	$	(10,668	)	$	(41,030	)
	Balance, December 31, 2011	$	15,080		$	(119,274	)	$	(392	)	$	(8,955	)	$	(113,541	)
	Total Other Comprehensive Income (Loss)	(1,579		)	75,743			60			(1,713		)	72,511
	Balance, September 30, 2012	$	13,501		$	(43,531	)	$	(332	)	$	(10,668	)	$	(41,030	)
	Balance, June 30, 2013	$	475		$	15,425		$	(275	)	$	(11,698	)	$	3,927
	Other Comprehensive Income (Loss) before reclassifications:
	Net change in unrealized gains (losses)	2,392			2,474			—			—			4,866
	Net change in fair value	—			(84		)	—			—			(84		)
	Accretion of non-credit loss	—			—			18			—			18
	Reclassifications from OCI to Net Income
	Net (gains) losses on sold securities	—			—			—			—			—
	Net Other-Than-Temporary Impairment Losses, credit portion	—			—			—			—			—
	Compensation and Benefits	—			—			—			6,175			6,175
	Total Other Comprehensive Income (Loss)	2,392			2,390			18			6,175			10,975
	Balance, September 30, 2013	$	2,867		$	17,815		$	(257	)	$	(5,523	)	$	14,902
	Balance, December 31, 2012	$	12,335		$	(9,684	)	$	(312	)	$	(12,397	)	$	(10,058	)
	Other Comprehensive Income (Loss) before reclassifications:
	Net change in unrealized gains (losses)	(9,468		)	7,615			—			—			(1,853		)
	Net change in fair value	—			35,095			—			—			35,095
	Accretion of non-credit loss	—			—			55			—			55
	Reclassifications from OCI to Net Income
	Net (gains) losses on sold securities	—			(17,135		)	—			—			(17,135		)
	Net Other-Than-Temporary Impairment Losses, credit portion	—			1,924			—			—			1,924
	Compensation and Benefits	—			—			—			6,874			6,874
	Total Other Comprehensive Income (Loss)	(9,468		)	27,499			55			6,874			24,960
	Balance, September 30, 2013	$	2,867		$	17,815		$	(257	)	$	(5,523	)	$	14,902

Employee_Retirement_and_Deferr

Employee Retirement and Deferred Compensation Plans	9 Months Ended
	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'
Employee Retirement and Deferred Compensation Plans	'
	Note 15 - Employee Retirement and Deferred Compensation Plans
	Nonqualified Supplemental Defined Benefit Retirement Plan. We participate in the SERP, a single-employer, non-qualified, unfunded supplemental executive retirement plan covering certain officers. This plan restores all or a portion of defined benefits to participating employees who have had their qualified defined benefits limited by Internal Revenue Service regulations. Since the SERP is a non-qualified unfunded plan, no contributions are required to be made during this year or thereafter. Payments of benefits may be made from the related grantor trust or from our general assets, and we may elect to make contributions to the grantor trust, in order to maintain a desired funding level.
	During the three and nine months ended September 30, 2013, we accelerated the amortization of previously unrecognized pension benefits from AOCI to Compensation and Benefits of $5,093 due to the retirement of our former President - CEO and the associated settlement of the related plan obligation.
	Components of the net periodic benefit cost of our SERP were:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Net Periodic Benefit Cost
	Service cost	$	136		$	224		$	592		$	667
	Interest cost	112			205			520			611
	Amortization of prior service benefit	(3		)	(3		)	(8		)	(8		)
	Amortization of net actuarial loss (gain)	135			392			875			1,167
	Net periodic benefit cost	380			818			1,979			2,437
	Settlement loss	5,093			—			5,093			—
	Total expense recorded in Compensation and Benefits	5,473			818			7,072			2,437
	Net loss (income) recognized in OCI	(6,175		)	570			(6,874		)	1,713
	Total recognized in Compensation and Benefits and in OCI	$	(702	)	$	1,388		$	198		$	4,150

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	Note 16 - Segment Information
	We have identified two primary operating segments:
	•	Traditional, which consists of credit products (including Advances, letters of credit, and lines of credit), investments (including Federal Funds Sold, Securities Purchased Under Agreements to Resell, AFS securities, and HTM securities), and correspondent services and deposits; and
	•	Mortgage Loans, which consists of mortgage loans purchased from our members through our MPP and participation interests purchased from the FHLBank of Topeka in mortgage loans originated by its members under the MPF program.
	The following table presents our financial performance by operating segment:
			Three Months Ended									Nine Months Ended
	September 30, 2013		Traditional			Mortgage Loans			Total			Traditional			Mortgage Loans			Total
	Net Interest Income		$	34,486		$	17,640		$	52,126		$	112,715		$	60,418		$	173,133
	Provision for (Reversal of) Credit Losses		—			314			314			—			(3,451		)	(3,451		)
	Other Income (Loss)		(856		)	1,407			551			27,359			1,104			28,463
	Other Expenses		18,324			1,841			20,165			46,347			4,751			51,098
	Income Before Assessments		15,306			16,892			32,198			93,727			60,222			153,949
	Affordable Housing Program Assessments		1,753			1,689			3,442			10,044			6,022			16,066
	Net Income		$	13,553		$	15,203		$	28,756		$	83,683		$	54,200		$	137,883
	September 30, 2012
	Net Interest Income		$	40,841		$	18,241		$	59,082		$	124,488		$	56,860		$	181,348
	Provision for (Reversal of) Credit Losses		—			5,634			5,634			—			7,917			7,917
	Other Income (Loss)		(1,336		)	(832		)	(2,168		)	(4,967		)	(3,688		)	(8,655		)
	Other Expenses		12,771			1,311			14,082			39,928			3,873			43,801
	Income Before Assessments		26,734			10,464			37,198			79,593			41,382			120,975
	Affordable Housing Program Assessments		3,010			1,046			4,056			9,019			4,138			13,157
	Net Income		$	23,724		$	9,418		$	33,142		$	70,574		$	37,244		$	107,818
	The following table presents asset balances by segment:
	By Date		Traditional			Mortgage Loans			Total
	September 30, 2013		$	33,417,188		$	6,159,647		$	39,576,835
	December 31, 2012		35,226,231			6,001,405			41,227,636

Estimated_Fair_Values

Estimated Fair Values	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Estimated Fair Values	'
	Note 17 - Estimated Fair Values
	We review the fair value hierarchy classifications on a quarterly basis. Changes in the observability of the inputs may result in a reclassification of certain assets or liabilities. Such reclassifications are reported as transfers in/out at estimated fair value as of the beginning of the quarter in which the changes occur. As described below, we reclassified six AFS securities from Level 3 to Level 2 during the nine months ended September 30, 2013. There were no such reclassifications during the three months ended September 30, 2013 or the three and nine months ended September 30, 2012.
	The following tables present the carrying value and estimated fair value of each of our financial assets and liabilities. The total of the estimated fair values does not represent an estimate of our overall market value as a going concern, which would take into account future business opportunities and the net profitability of assets and liabilities among other considerations.
			September 30, 2013
						Estimated Fair Value
			Carrying															Netting
	Financial Instruments		Value			Total			Level 1			Level 2			Level 3			Adjustment (1)
	Assets:
	Cash and Due from Banks		$	514,383		$	514,383		$	514,383		$	—		$	—		$	—
	Interest-Bearing Deposits		487			487			—			487			—			—
	Securities Purchased Under Agreements to Resell		2,700,000			2,700,000			—			2,700,000			—			—
	Federal Funds Sold		245,000			245,000			—			245,000			—			—
	AFS securities		3,688,783			3,688,783			—			3,200,214			488,569			—
	HTM securities		7,321,459			7,437,226			—			7,260,140			177,086			—
	Advances		18,796,297			18,900,794			—			18,900,794			—			—
	Mortgage Loans Held for Portfolio, net		6,159,647			6,305,330			—			6,256,720			48,610			—
	Accrued Interest Receivable		81,966			81,966			—			81,966			—			—
	Derivative Assets, net		7,655			7,655			—			115,613			—			(107,958		)
	Grantor Trust Assets (included in Other Assets)		12,061			12,061			12,061			—			—			—
	Liabilities:
	Deposits		1,114,509			1,114,509			—			1,114,509			—			—
	Consolidated Obligations:
	Discount Notes		7,804,773			7,806,128			—			7,806,128			—			—
	CO Bonds		27,623,120			27,710,117			—			27,710,117			—			—
	Accrued Interest Payable		94,866			94,866			—			94,866			—			—
	Derivative Liabilities, net		187,234			187,234			—			691,361			—			(504,127		)
	MRCS		255,319			255,319			255,319			—			—			—
			December 31, 2012
						Estimated Fair Value
			Carrying															Netting
	Financial Instruments		Value			Total			Level 1			Level 2			Level 3			Adjustment (1)
	Assets:
	Cash and Due from Banks		$	105,472		$	105,472		$	105,472		$	—		$	—		$	—
	Interest-Bearing Deposits		48			48			—			48			—			—
	Securities Purchased Under Agreements to Resell		3,250,000			3,250,000			—			3,250,000			—			—
	Federal Funds Sold		2,110,000			2,110,000			—			2,110,000			—			—
	AFS securities		3,980,580			3,980,580			—			3,340,438			640,142			—
	HTM securities		7,504,643			7,738,596			—			7,490,101			248,495			—
	Advances		18,129,458			18,298,372			—			18,298,372			—			—
	Mortgage Loans Held for Portfolio, net		6,001,405			6,318,983			—			6,265,990			52,993			—
	Accrued Interest Receivable		87,455			87,455			—			87,455			—			—
	Derivative Assets, net		821			821			—			73,578			—			(72,757		)
	Grantor Trust Assets (included in Other Assets)		18,440			18,440			18,440			—			—			—
	Liabilities:
	Deposits		1,787,151			1,787,151			—			1,787,151			—			—
	Consolidated Obligations:
	Discount Notes		8,924,085			8,925,828			—			8,925,828			—			—
	CO Bonds		27,407,530			28,162,392			—			28,162,392			—			—
	Accrued Interest Payable		87,777			87,777			—			87,777			—			—
	Derivative Liabilities, net		201,115			201,115			—			951,521			—			(750,406		)
	MRCS		450,716			450,716			450,716			—			—			—
	(1)	Amounts represent the application of the netting requirements that allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing agent and/or counterparty.
	Summary of Valuation Techniques and Significant Inputs. A description of the valuation techniques, significant inputs, and levels of fair value hierarchy is disclosed in Note 19 - Estimated Fair Values in our 2012 Form 10-K, and no changes have been made in the current year, except as disclosed below.
	Derivative Assets/Liabilities. The estimated fair values of our derivatives are adjusted for counterparty nonperformance risk, particularly credit risk, as appropriate. Our nonperformance risk adjustment is computed using observable credit default swap spreads and estimated probability default rates applied to our exposure after taking into consideration collateral held or placed. The nonperformance risk adjustment is not material to our derivative valuations or financial statements.
	Estimated Fair Value Measurements. The following tables present by level within the fair value hierarchy the estimated fair value of our financial assets and liabilities that are recorded at estimated fair value on a recurring basis on our Statement of Condition. We did not have any financial assets or liabilities recorded at estimated fair value on a non-recurring basis on our Statement of Condition as of September 30, 2013 or December 31, 2012.
															Netting
	September 30, 2013		Total			Level 1			Level 2			Level 3			Adjustment (1)
	AFS securities:
	GSE and TVA debentures		$	3,200,214		$	—		$	3,200,214		$	—		$	—
	Private-label RMBS		488,569			—			—			488,569			—
	Total AFS securities		3,688,783			—			3,200,214			488,569			—
	Derivative Assets:
	Interest-rate related		6,408			—			114,366			—			(107,958		)
Interest-rate futures/forwards		—			—			—			—			—
MDCs		1,247			—			1,247			—			—
Total Derivative Assets, net		7,655			—			115,613			—			(107,958		)
Grantor Trust Assets (included in Other Assets)		12,061			12,061			—			—			—
Total recurring assets at estimated fair value		$	3,708,499		$	12,061		$	3,315,827		$	488,569		$	(107,958	)
Derivative Liabilities:
Interest-rate related		$	184,755		$	—		$	688,882		$	—		$	(504,127	)
Interest-rate futures/forwards		2,479			—			2,479			—			—
MDCs		—			—			—			—			—
Total Derivative Liabilities, net		187,234			—			691,361			—			(504,127		)
Total recurring liabilities at estimated fair value		$	187,234		$	—		$	691,361		$	—		$	(504,127	)
December 31, 2012
AFS securities:
GSE and TVA debentures		$	3,340,438		$	—		$	3,340,438		$	—		$	—
Private-label RMBS		640,142			—			—			640,142			—
Total AFS securities		3,980,580			—			3,340,438			640,142			—
Derivative Assets:
Interest-rate related		302			—			73,059			—			(72,757		)
Interest-rate futures/forwards		230			—			230			—			—
MDCs		289			—			289			—			—
Total Derivative Assets, net		821			—			73,578			—			(72,757		)
Grantor Trust Assets (included in Other Assets)		18,440			18,440			—			—			—
Total recurring assets at estimated fair value		$	3,999,841		$	18,440		$	3,414,016		$	640,142		$	(72,757	)
Derivative Liabilities:
Interest-rate related		$	201,043		$	—		$	951,449		$	—		$	(750,406	)
Interest-rate futures/forwards		43			—			43			—			—
MDCs		29			—			29			—			—
Total Derivative Liabilities, net		201,115			—			951,521			—			(750,406		)
Total recurring liabilities at estimated fair value		$	201,115		$	—		$	951,521		$	—		$	(750,406	)
(1)	Amounts represent the application of the netting requirements that allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing agent and/or counterparty.
Level 3 Disclosures for All Assets and Liabilities that are Measured at Fair Value on a Recurring Basis. The table below presents a rollforward of our AFS private-label RMBS measured at estimated fair value on a recurring basis using Level 3 significant inputs. The estimated fair values for the private-label RMBS were valued using a pricing source, such as a dealer quote or comparable security price, for which the significant unobservable inputs used to determine the price were not reasonably available.
		Three Months Ended September 30,						Nine Months Ended September 30,
Level 3 Rollforward		2013			2012			2013			2012
Balance, beginning of period		$	511,952		$	602,975		$	640,142		$	601,309
Total realized and unrealized gains (losses):
Accretion of credit losses in Net Interest Income		37			89			95			644
Net gains (losses) on changes in fair value in Other Income (Loss)		—			(14		)	—			(3,592		)
Net change in fair value not in excess of cumulative non-credit losses in OCI		(84		)	32,311			12,625			64,096
Unrealized gains (losses) in OCI		2,474			3,301			16,843			8,055
Reclassification of non-credit portion in OCI to Other Income (Loss)		—			14			—			3,592
Purchases, issuances, sales and settlements:
Settlements		(25,810		)	(17,735		)	(56,957		)	(53,163		)
Transfers out		—			—			(124,179		)	—
Balance, end of period		$	488,569		$	620,941		$	488,569		$	620,941
Net gains (losses) included in earnings attributable to changes in fair value relating to assets still held at end of period		$	37		$	75		$	95		$	(2,948	)
We classified the six securities we sold on April 4, 2013 as Level 2 within the fair value hierarchy as of March 31, 2013 because the estimated fair values were derived from and corroborated by the sales prices in actual market transactions. The total estimated fair value of these six securities that we transferred from Level 3 to Level 2 was $124,179 as of January 1, 2013, the beginning of the quarter in which the transfer occurred.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Note 18 - Commitments and Contingencies
	The following table presents our off-balance-sheet commitments at their notional amounts:
			September 30, 2013
	By Commitment		Expire within one year		Expire after one year		Total
	Standby letters of credit outstanding		$	112,594	$	153,433	$	266,027
	Unused lines of credit		793,552		—		793,552
	Commitments to fund additional Advances (1)		20,550		—		20,550
	Commitments to fund or purchase mortgage loans and participation interests		101,983		—		101,983
	Unsettled CO Bonds, at par (2)		1,010,000		—		1,010,000
	(1)	Commitments to fund additional Advances are generally for periods up to six months and include no outstanding commitments to issue standby letters of credit.
	(2)	Unsettled CO Bonds of $1,000,000 were hedged with associated interest-rate swaps.
	Pledged Collateral. At September 30, 2013 and December 31, 2012, we had pledged cash collateral, at par, of $396,944 and $677,550, respectively, to counterparties and clearing agents. At September 30, 2013 and December 31, 2012, we had not pledged any securities as collateral.
	Legal Proceedings. We are subject to legal proceedings arising in the normal course of business. After consultation with legal counsel, management does not anticipate that the ultimate liability, if any, arising out of these matters will have a material effect on our financial condition or results of operations.
	Additional discussion of other commitments and contingencies is provided in Note 6 - Advances; Note 7 - Mortgage Loans Held for Portfolio; Note 9 - Derivatives and Hedging Activities; Note 11 - Consolidated Obligations; Note 13 - Capital; and Note 17 - Estimated Fair Values.

Transactions_with_Related_Part

Transactions with Related Parties	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
Transactions with Related Parties	'
	Note 19 - Transactions with Related Parties
	For financial reporting purposes, we define related parties as those members, and former members and their affiliates, with capital stock outstanding in excess of 10% of our total outstanding Capital Stock and MRCS. Transactions with such related parties are entered into in the normal course of business and are subject to the same eligibility and credit criteria, as well as the same terms and conditions, as other similar transactions. In addition, under our Capital Plan, our members (including directors' financial institutions) have an activity-based Capital Stock requirement pursuant to which they purchase additional Capital Stock in specified amounts (generally expressed as a percentage of the transaction amount) when they obtain Advances from us or in certain cases sell mortgage loans to us.
	The following table presents the outstanding balances with respect to transactions with related parties and their balance as a percent of the total balance on our Statement of Condition.
			Capital Stock, including MRCS					Advances							Mortgage Loans Held for Portfolio (2)
	September 30, 2013		Balance,		% of Total			Balance,				% of Total			UPB		% of Total
			par value					par value
	Flagstar Bank, FSB		$	301,737	16	%		$	2,907,598			16	%		$	554,658	9	%
	Total (1)		$	301,737	16	%		$	2,907,598			16	%		$	554,658	9	%
	December 31, 2012
	Flagstar Bank, FSB		$	301,737	14	%		$	3,180,000			18	%		$	656,931	11	%
	Bank of America, N.A. (former member)		224,921		11	%		300,000				2	%		1,210,009		20	%
	Total		$	526,658	25	%		$	3,480,000			20	%		$	1,866,940	31	%
	(1)	Bank of America, N.A. did not meet the definition of a related party as of September 30, 2013 as a result of our repurchase of excess stock in February 2013.
	(2)	Represents UPB of mortgage loans purchased from related party.
	During the three and nine months ended September 30, 2013 and 2012, we had net Advances to (repayments from) related parties as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	Related Party		2013		2012				2013				2012
	Flagstar Bank, FSB		$	7,598	$	(312,000	)		$	(272,402	)		$	(865,000	)
	Bank of America, N.A. (former member) (1)		—		—				—				(100,000		)
	(1)	Bank of America, N.A. did not meet the definition of a related party following our repurchase of excess stock in February 2013.
	We did not acquire any mortgage loans from related parties during the three and nine months ended September 30, 2013 and 2012.
	Transactions with Directors' Financial Institutions. We provide, in the ordinary course of business, products and services to members whose officers or directors serve on our board of directors. In accordance with Finance Agency regulations, transactions with directors' financial institutions are executed on the same terms as those with any other member.
	The following table presents the outstanding balances with respect to transactions with directors' financial institutions and their balance as a percent of the total balance on our Statement of Condition.
			Capital Stock, including MRCS					Advances							Mortgage Loans Held for Portfolio (1)
	Date		Balance,		% of Total			Balance,				% of Total			UPB		% of Total
			par value					par value
	September 30, 2013		$	42,842	2	%		$	238,815			1	%		$	78,774	1	%
	December 31, 2012		74,114		4	%		462,758				3	%		74,235		1	%
	(1)	Represents UPB of mortgage loans purchased from Directors' Financial Institutions.
	During the three and nine months ended September 30, 2013 and 2012, net Advances to (repayments from) directors' financial institutions and mortgage loans acquired from directors' financial institutions, taking into account the dates of the directors' appointments and resignations, were as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	Transactions with Directors' Financial Institutions		2013		2012				2013				2012
	Net Advances (repayments)		$	13,678	$	(18,931	)		$	(108,340	)		$	(21,717	)
	Mortgage loans acquired		8,110		12,515				21,271				24,854
	Transactions with Other FHLBanks. During the three and nine months ended September 30, 2013, we purchased $53,581 and $309,477, respectively, of participation interests from the FHLBank of Topeka in mortgage loans originated by its members under the MPF program, compared with $65,338 for both the three and nine months ended September 30, 2012.
	Beginning in July 2012, we pay an MPF Provider fee to the FHLBank of Chicago for our participation in the MPF program that is recorded in Other Expenses. For the three and nine months ended September 30, 2013, we paid such fees in the amount of $68 and $160, respectively, compared to $2 for the three and nine months ended September 30, 2012.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	Note 20 - Subsequent Events
	On September 19, 2013, we announced our intention to repurchase up to $250,000 par value of excess stock held as of August 31, 2013 by shareholders that are members or former members (or their successors-in-interest) in accordance with Section VI.C. of our capital plan dated September 19, 2002 (as amended effective September 5, 2011). The repurchases occurred in October 2013, and included $13,952 contractually due in 2013 and $236,048 not contractually due for redemption until 2014 or later. The repurchases included $95,489 of capital stock under redemption requests and $154,511 of MRCS.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Use of Estimates, Policy	'
	Use of Estimates. The preparation of financial statements in accordance with GAAP requires us to make subjective assumptions and estimates that may affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported amounts of income and expense. Actual results could differ significantly from these estimates.
Financial Instruments with Legal Right of Offset, Policy	'
	Financial Instruments with Legal Right of Offset. We present certain financial instruments, including derivative instruments and securities purchased under agreements to resell, on a net basis when they have a legal right of offset and all other requirements for netting are met (collectively referred to as the netting requirements). For these financial instruments, we have elected to offset our derivative asset and liability positions, as well as cash collateral received or pledged, when we have met the netting requirements.
	For derivative instruments that meet the netting requirements, any excess cash collateral received or pledged is recognized as a derivative liability or derivative asset.
Investment Securities, Policy	'
	On a quarterly basis, we evaluate for OTTI our individual AFS and HTM securities that have been previously OTTI or are in an unrealized loss position. As part of our evaluation, we consider whether we intend to sell each security and whether it is more likely than not that we will be required to sell the security before its anticipated recovery.
	If either of these conditions is met, we recognize an OTTI loss in earnings equal to the entire difference between the debt security's amortized cost and its estimated fair value as of the Statement of Condition date.
Fair Value of Financial Instruments, Policy	'
	Derivative Assets/Liabilities. The estimated fair values of our derivatives are adjusted for counterparty nonperformance risk, particularly credit risk, as appropriate. Our nonperformance risk adjustment is computed using observable credit default swap spreads and estimated probability default rates applied to our exposure after taking into consideration collateral held or placed. The nonperformance risk adjustment is not material to our derivative valuations or financial statements.

AvailableforSale_Securities_Ta

Available-for-Sale Securities (Tables)	9 Months Ended
	Sep. 30, 2013
Available-for-sale Securities [Line Items]	'
Available-for-Sale (AFS) Securities by Major Security Type [Table Text Block]	'
	The following table presents information on our AFS securities:
								Gross		Gross
			Amortized		Non-Credit			Unrealized		Unrealized			Estimated
	September 30, 2013		Cost (1)		OTTI			Gains		Losses			Fair Value
	GSE and TVA debentures		$	3,197,347	$	—		$	8,646	$	(5,779	)	$	3,200,214
	Private-label RMBS		470,754		(242		)	18,057		—			488,569
	Total AFS securities		$	3,668,101	$	(242	)	$	26,703	$	(5,779	)	$	3,688,783
	December 31, 2012
	GSE and TVA debentures		$	3,328,103	$	—		$	13,007	$	(672	)	$	3,340,438
	Private-label RMBS		649,826		(20,126		)	10,442		—			640,142
	Total AFS securities		$	3,977,929	$	(20,126	)	$	23,449	$	(672	)	$	3,980,580
	(1)	Amortized cost of AFS securities includes adjustments made to the cost basis of an investment for accretion, amortization, collection of principal, and, if applicable, OTTI recognized in earnings (credit losses) and fair-value hedge accounting adjustments.
Schedule of Realized Gain (Loss) [Table Text Block]	'
	The following table presents the proceeds, previously recognized OTTI credit losses including accretion, and gross realized gains and losses related to the sale of six OTTI AFS securities, only one of which was in an unrealized loss position. In the first quarter of 2013, we recorded an OTTI credit charge for this security, representing the entire difference between our amortized cost basis and its estimated fair value, which resulted in no gross realized losses related to the sale. We compute gains and losses on sales of investment securities using the specific identification method.
			Three Months Ended September 30,					Nine Months Ended September 30,
	Sales of AFS Securities		2013		2012			2013		2012
	Proceeds from sale		$	—	$	—		$	129,471	$	—
	Previously recognized OTTI credit losses including accretion		$	—	$	—		$	38,806	$	—
	Gross realized gains		$	—	$	—		$	17,135	$	—
	Gross realized losses		—		—			—		—
	Net Realized Gains from Sale of Available-for-Sale Securities		$	—	$	—		$	17,135	$	—
Available-for-sale Securities [Member]	'
Available-for-sale Securities [Line Items]	'
AFS Securities in a Continuous Unrealized Loss Position [Table Text Block]	'
	The following table presents impaired AFS securities (i.e., in an unrealized loss position), which are aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position.
			Less than 12 months					12 months or more					Total
			Estimated		Unrealized			Estimated		Unrealized			Estimated		Unrealized
	September 30, 2013		Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
	GSE and TVA debentures		$	998,420	$	(5,779	)	$	—	$	—		$	998,420	$	(5,779	)
	Private-label RMBS		—		—			7,719		(242		)	7,719		(242		)
	Total impaired AFS securities		$	998,420	$	(5,779	)	$	7,719	$	(242	)	$	1,006,139	$	(6,021	)
	December 31, 2012
	GSE and TVA debentures		$	398,265	$	(672	)	$	—	$	—		$	398,265	$	(672	)
	Private-label RMBS		—		—			471,359		(20,126		)	471,359		(20,126		)
	Total impaired AFS securities		$	398,265	$	(672	)	$	471,359	$	(20,126	)	$	869,624	$	(20,798	)
AFS Securities by Contractual Maturity [Table Text Block]	'
	The amortized cost and estimated fair value of non-MBS AFS securities by contractual maturity are presented below. MBS are not presented by contractual maturity because their actual maturities will likely differ from contractual maturities as borrowers have the right to prepay obligations with or without prepayment fees.
			September 30, 2013					December 31, 2012
			Amortized		Estimated			Amortized		Estimated
	Year of Contractual Maturity		Cost		Fair Value			Cost		Fair Value
	Due in one year or less		$	—	$	—		$	—	$	—
	Due after one year through five years		2,040,424		2,048,487			2,038,791		2,048,429
	Due after five years through ten years		1,123,231		1,118,511			1,197,884		1,200,979
	Due after ten years		33,692		33,216			91,428		91,030
	Total Non-MBS		3,197,347		3,200,214			3,328,103		3,340,438
	Total MBS		470,754		488,569			649,826		640,142
	Total AFS securities		$	3,668,101	$	3,688,783		$	3,977,929	$	3,980,580

HeldtoMaturity_Securities_Tabl

Held-to-Maturity Securities (Tables)	9 Months Ended
	Sep. 30, 2013
Schedule of Held-to-maturity Securities [Line Items]	'
HTM Securities by Major Security Type [Table Text Block]	'
	The following table presents information on our HTM securities:
										Gross			Gross
										Unrecognized			Unrecognized
			Amortized		Non-Credit			Carrying		Holding			Holding			Estimated
	September 30, 2013		Cost (1)		OTTI			Value (2)		Gains (3)			Losses (3)			Fair Value
	GSE debentures		$	268,998	$	—		$	268,998	$	663		$	—		$	269,661
	MBS and ABS:
	Other U.S. obligations -guaranteed RMBS		3,090,243		—			3,090,243		53,058			(11,493		)	3,131,808
	GSE RMBS		3,781,786		—			3,781,786		81,713			(4,828		)	3,858,671
	Private-label RMBS		165,093		—			165,093		488			(1,802		)	163,779
	Manufactured housing loan ABS		13,410		—			13,410		—			(2,010		)	11,400
	Home equity loan ABS		2,186		(257		)	1,929		105			(127		)	1,907
	Total MBS and ABS		7,052,718		(257		)	7,052,461		135,364			(20,260		)	7,167,565
	Total HTM securities		$	7,321,716	$	(257	)	$	7,321,459	$	136,027		$	(20,260	)	$	7,437,226
	December 31, 2012
	GSE debentures		$	268,996	$	—		$	268,996	$	357		$	—		$	269,353
	MBS and ABS:
	Other U.S. obligations -guaranteed RMBS		3,123,784		—			3,123,784		84,169			(1,345		)	3,206,608
	GSE RMBS		3,859,172		—			3,859,172		155,044			(76		)	4,014,140
	Private-label RMBS		235,778		—			235,778		992			(2,577		)	234,193
	Manufactured housing loan ABS		14,779		—			14,779		—			(2,276		)	12,503
	Home equity loan ABS		2,446		(312		)	2,134		5			(340		)	1,799
	Total MBS and ABS		7,235,959		(312		)	7,235,647		240,210			(6,614		)	7,469,243
	Total HTM securities		$	7,504,955	$	(312	)	$	7,504,643	$	240,567		$	(6,614	)	$	7,738,596
	(1)	Amortized cost includes adjustments made to the cost basis of an investment for accretion, amortization, collection of principal, and, if applicable, OTTI recognized in earnings (credit losses).
	(2)	Carrying value of HTM securities represents amortized cost after adjustment for non-credit OTTI recognized in AOCI.
	(3)	Gross unrecognized holding gains (losses) represents the difference between estimated fair value and carrying value.
Held-to-maturity Securities [Member]	'
Schedule of Held-to-maturity Securities [Line Items]	'
HTM Securities in a Continuous Unrealized Loss Position [Table Text Block]	'
	The following table presents impaired HTM securities (i.e., in an unrealized loss position), aggregated by major security type and length of time that individual securities have been in a continuous unrealized loss position. None of our non-MBS were in an unrealized loss position at September 30, 2013 or December 31, 2012.
			Less than 12 months					12 months or more					Total
			Estimated		Unrealized			Estimated		Unrealized			Estimated			Unrealized
	September 30, 2013		Fair Value		Losses			Fair Value		Losses			Fair Value			Losses (1)
	MBS and ABS:
	Other U.S. obligations - guaranteed RMBS		$	1,415,791	$	(7,734	)	$	435,953	$	(3,759	)	$	1,851,744		$	(11,493	)
	GSE RMBS		1,357,575		(4,805		)	7,590		(23		)	1,365,165			(4,828		)
	Private-label RMBS		48,662		(311		)	64,397		(1,491		)	113,059			(1,802		)
	Manufactured housing loan ABS		—		—			11,399		(2,010		)	11,399			(2,010		)
	Home equity loan ABS		—		—			1,907		(279		)	1,907			(279		)
	Total MBS and ABS		2,822,028		(12,850		)	521,246		(7,562		)	3,343,274			(20,412		)
	Total impaired HTM securities		$	2,822,028	$	(12,850	)	$	521,246	$	(7,562	)	$	3,343,274		$	(20,412	)
	December 31, 2012
	MBS and ABS:
	Other U.S. obligations - guaranteed RMBS		$	274,784	$	(432	)	$	460,152	$	(913	)	$	734,936		$	(1,345	)
	GSE RMBS		124,225		(76		)	—		—			124,225			(76		)
	Private-label RMBS		7,258		(36		)	155,651		(2,541		)	162,909			(2,577		)
	Manufactured housing loan ABS		—		—			12,503		(2,276		)	12,503			(2,276		)
	Home equity loan ABS		—		—			1,799		(647		)	1,799			(647		)
	Total MBS and ABS		406,267		(544		)	630,105		(6,377		)	1,036,372			(6,921		)
	Total impaired HTM securities		$	406,267	$	(544	)	$	630,105	$	(6,377	)	$	1,036,372		$	(6,921	)
	(1)	Total unrealized losses on home equity loan ABS will not agree to total gross unrecognized holding losses. Total unrealized losses include non-credit-related OTTI losses recorded in AOCI and gross unrecognized holding gains on previously OTTI securities.
HTM Securities by Contractual Maturity [Table Text Block]	'
	The amortized cost, carrying value and estimated fair value of non-MBS HTM securities by contractual maturity are presented below. MBS and ABS are not presented by contractual maturity because their actual maturities will likely differ from contractual maturities as certain borrowers have the right to prepay obligations with or without prepayment fees.
			September 30, 2013							December 31, 2012
			Amortized		Carrying			Estimated		Amortized			Carrying			Estimated
	Year of Contractual Maturity		Cost (1)		Value (2)			Fair Value		Cost (1)			Value (2)			Fair Value
	Non-MBS:
	Due in one year or less		$	—	$	—		$	—	$	—		$	—		$	—
	Due after one year through five years		268,998		268,998			269,661		268,996			268,996			269,353
	Due after five years through ten years		—		—			—		—			—			—
	Due after ten years		—		—			—		—			—			—
	Total Non-MBS		268,998		268,998			269,661		268,996			268,996			269,353
	Total MBS and ABS		7,052,718		7,052,461			7,167,565		7,235,959			7,235,647			7,469,243
	Total HTM securities		$	7,321,716	$	7,321,459		$	7,437,226	$	7,504,955		$	7,504,643		$	7,738,596
	(1)	Amortized cost includes adjustments made to the cost basis of an investment for accretion, amortization, collection of principal, and, if applicable, OTTI recognized in earnings (credit losses).
	(2)	Carrying value of HTM securities represents amortized cost after adjustment for non-credit OTTI recognized in AOCI.

OtherThanTemporary_Impairments1

Other-Than-Temporary Impairments Analysis (Tables)	9 Months Ended
	Sep. 30, 2013
Other Than Temporary Impairments Analysis [Abstract]	'
Rollforward of the Amounts Related to Credit Losses Recognized into Earnings [Table Text Block]	'
	The following table presents a rollforward of the amounts related to credit losses recognized in earnings. The rollforward excludes accretion of credit losses for securities that have not experienced a significant increase in cash flows.
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
	Credit Loss Rollforward	2013		2012		2013			2012
	Balance at beginning of period	$	72,287	$	109,214	$	109,169		$	105,636
	Additions:
	Additional credit losses for which OTTI was previously recognized	—		14		1,924			3,594
	Reductions:
	Credit losses on securities sold, matured, paid down or prepaid	—		—		(30,506		)	(2		)
	Unamortized life-to-date credit losses on security that we intend to sell before recovery of its amortized cost basis	—		—		(8,300		)	—
	Balance at end of period	$	72,287	$	109,228	$	72,287		$	109,228
Total Securities Other-than-Temporarily Impaired during the Life of the Security [Table Text Block]	'
	The following table presents the September 30, 2013 classification and balances of OTTI securities impaired prior to September 30, 2013 (i.e., life to date) but not necessarily as of September 30, 2013. Securities are classified based on the originator's classification at the time of origination or based on the classification by the NRSROs upon issuance. Because there is no universally accepted definition of prime, Alt-A or subprime underwriting standards, such classifications are subjective.
		September 30, 2013
		HTM Securities										AFS Securities
	OTTI Life-to-Date	UPB		Amortized Cost		Carrying Value			Estimated Fair Value			UPB		Amortized Cost		Estimated Fair Value
	Private-label RMBS - prime	$	—	$	—	$	—		$	—		$	539,339	$	470,754	$	488,569
	Private-label RMBS - Alt-A	—		—		—			—			—		—		—
	Home equity loan ABS - subprime	920		884		627			732			—		—		—
	Total OTTI securities	$	920	$	884	$	627		$	732		$	539,339	$	470,754	$	488,569

Advances_Tables

Advances (Tables)	9 Months Ended
	Sep. 30, 2013
Advances [Abstract]	'
Advances Redemption Terms [Table Text Block]	'
	We had Advances outstanding, as presented below by year of contractual maturity, with interest rates ranging from 0% to 8.34%.
		September 30, 2013					December 31, 2012
	Year of Contractual Maturity	Amount			WAIR %		Amount			WAIR %
	Overdrawn demand and overnight deposit accounts	$	17		2.5		$	15,004		2.5
	Due in 1 year or less	4,184,443			0.67		3,761,551			1.57
	Due after 1 year through 2 years	2,019,963			2.56		1,365,251			2.66
	Due after 2 years through 3 years	3,832,451			2.4		2,287,033			3.11
	Due after 3 years through 4 years	2,969,219			2.35		3,435,097			2.61
	Due after 4 years through 5 years	2,027,387			2.23		2,448,083			2.22
	Thereafter	3,332,013			2.04		4,070,200			2.49
	Total Advances, par value	18,365,493			1.93		17,382,219			2.38
	Unamortized discounts (including AHP)	(3,220		)			(1,284		)
	Hedging adjustments	323,670					577,225
	Unamortized swap termination fees associated with modified Advances	110,354					171,298
	Total Advances	$	18,796,297				$	18,129,458
Advances by Year of Contractual Maturity, Next Call Date, or Next Put or Convert Date [Table Text Block]	'
	The following table presents Advances by the earlier of the year of contractual maturity or the next call date and next put date:
		Year of Contractual Maturity						Year of Contractual Maturity
		or Next Call Date						or Next Put Date
		September 30,			December 31,			September 30,			December 31,
		2013			2012			2013			2012
	Overdrawn demand and overnight deposit accounts	$	17		$	15,004		$	17		$	15,004
	Due in 1 year or less	6,544,808			5,800,961			4,382,443			4,070,551
	Due after 1 year through 2 years	1,996,713			1,348,251			2,010,463			1,327,251
	Due after 2 years through 3 years	3,896,451			2,163,783			3,803,451			2,250,533
	Due after 3 years through 4 years	2,736,469			3,539,097			2,879,719			3,405,097
	Due after 4 years through 5 years	1,812,387			2,310,333			1,977,387			2,328,583
	Thereafter	1,378,648			2,204,790			3,312,013			3,985,200
	Total Advances, par value	$	18,365,493		$	17,382,219		$	18,365,493		$	17,382,219

Mortgage_Loans_Held_for_Portfo1

Mortgage Loans Held for Portfolio (Tables)	9 Months Ended
	Sep. 30, 2013
Mortgage Loans on Real Estate [Abstract]	'
Mortgage Loans Held for Portfolio [Table Text Block]	'
	The following tables present information on Mortgage Loans Held for Portfolio:
			September 30, 2013
	By Term		MPP			MPF			Total
	Fixed-rate medium-term (1) mortgages		$	1,026,871		$	82,947		$	1,109,818
	Fixed-rate long-term (2) mortgages		4,519,256			432,299			4,951,555
	Total Mortgage Loans Held for Portfolio, UPB		5,546,127			515,246			6,061,373
	Unamortized premiums		102,325			10,536			112,861
	Unamortized discounts		(12,187		)	(114		)	(12,301		)
	Hedging adjustments		3,891			(677		)	3,214
	Allowance for loan losses		(5,000		)	(500		)	(5,500		)
	Total Mortgage Loans Held for Portfolio, net		$	5,635,156		$	524,491		$	6,159,647
			December 31, 2012
	By Term		MPP			MPF			Total
	Fixed-rate medium-term (1) mortgages		$	960,944		$	41,014		$	1,001,958
	Fixed-rate long-term (2) mortgages		4,735,020			189,166			4,924,186
	Total Mortgage Loans Held for Portfolio, UPB		5,695,964			230,180			5,926,144
	Unamortized premiums		81,459			6,323			87,782
	Unamortized discounts		(12,266		)	—			(12,266		)
	Hedging adjustments		8,859			886			9,745
	Allowance for loan losses		(9,850		)	(150		)	(10,000		)
	Total Mortgage Loans Held for Portfolio, net		$	5,764,166		$	237,239		$	6,001,405
	(1)	Medium-term is defined as a term of 15 years or less at origination.
	(2)	Long-term is defined as a term greater than 15 years at origination.
Mortgage Loans Held for Portfolio by Collateral/Guarantee Type [Table Text Block]	'
			September 30, 2013
	By Type		MPP			MPF			Total
	Conventional		$	4,786,021		$	412,634		$	5,198,655
	Government		760,106			102,612			862,718
	Total Mortgage Loans Held for Portfolio, UPB		$	5,546,127		$	515,246		$	6,061,373
			December 31, 2012
	By Type		MPP			MPF			Total
	Conventional		$	4,810,269		$	177,204		$	4,987,473
	Government		885,695			52,976			938,671
	Total Mortgage Loans Held for Portfolio, UPB		$	5,695,964		$	230,180		$	5,926,144

Allowance_for_Credit_Losses_Ta

Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2013
Allowance for Credit Losses [Abstract]	'
Impact of MPP Risk Sharing Structure on Allowance for Credit Losses [Table Text Block]	'
	The following table presents the impact of credit enhancements on the allowance:
	MPP Credit Waterfall		September 30,			December 31,
			2013			2012
	Estimated losses remaining after borrower's equity, before credit enhancements		$	35,963		$	51,465
	Portion of estimated losses recoverable from PMI		(4,977		)	(6,494		)
	Portion of estimated losses recoverable from LRA		(5,216		)	(7,750		)
	Portion of estimated losses recoverable from SMI		(22,455		)	(33,438		)
	Allowance for unrecoverable PMI/SMI		1,685			6,067
	Allowance for MPP loan losses		$	5,000		$	9,850
Changes in Lender Risk Account [Table Text Block]	'
	The following table presents the activity in the LRA:
			Nine Months Ended September 30,
	LRA Activity		2013			2012
	Balance of LRA, beginning of period		$	33,693		$	23,408
	Additions		12,555			13,017
	Claims paid		(2,422		)	(6,165		)
	Distributions		(761		)	(634		)
	Balance of LRA, end of period		$	43,065		$	29,626
MPF Credit Enhancement Fees [Table Text Block]	'
	MPF Credit Enhancements. The following table presents the activity related to MPF Credit Enhancements:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	MPF CE Fees		2013			2012			2013			2012
	Gross CE Fees paid to PFIs		$	90		$	1		$	207		$	1
	Performance-based CE Fees recovered from PFIs		—			—			—			—
	Net CE Fees paid		$	90		$	1		$	207		$	1
Rollforward of Allowance for Credit Losses on Mortgage Loans [Table Text Block]	'
	The tables below present a rollforward of our allowance for loan losses on mortgage loans, the allowance for loan losses by impairment methodology, and the recorded investment in mortgage loans by impairment methodology. The recorded investment in a loan is the UPB of the loan, adjusted for accrued interest, net of deferred loan fees or costs, unamortized premiums or discounts (which may include the basis adjustment related to any gain or loss on a delivery commitment prior to being funded) and direct write-downs. The recorded investment is not net of any valuation allowance.
			MPP			MPF
	Rollforward of Allowance		Conventional			Conventional			Total
	Allowance for loan losses on mortgage loans, June 30, 2013		$	5,000		$	500		$	5,500
	Charge-offs		(314		)	—			(314		)
	Provision for (Reversal of) loan losses		314			—			314
	Allowance for loan losses on mortgage loans, September 30, 2013		$	5,000		$	500		$	5,500
	Allowance for loan losses on mortgage loans, December 31, 2012		$	9,850		$	150		$	10,000
	Charge-offs		(1,049		)	—			(1,049		)
	Provision for (Reversal of) for loan losses		(3,801		)	350			(3,451		)
	Allowance for loan losses on mortgage loans, September 30, 2013		$	5,000		$	500		$	5,500
	Allowance for loan losses on mortgage loans, June 30, 2012		$	5,000		$	—		$	5,000
	Charge-offs		(634		)	—			(634		)
	Provision for (Reversal of) loan losses		5,609			25			5,634
	Allowance for loan losses on mortgage loans, September 30, 2012		$	9,975		$	25		$	10,000
	Allowance for loan losses on mortgage loans, December 31, 2011		$	3,300		$	—		$	3,300
	Charge-offs		(1,217		)	—			(1,217		)
	Provision for (Reversal of) for loan losses		7,892			25			7,917
	Allowance for loan losses on mortgage loans, September 30, 2012		$	9,975		$	25		$	10,000
Allowance for Credit Losses and Recorded Investment by Impairment Methodology [Table Text Block]	'
			MPP			MPF
	Allowance for Loan Losses, September 30, 2013		Conventional			Conventional			Total
	Loans collectively evaluated for impairment		$	4,252		$	500		$	4,752
	Loans individually evaluated for impairment (1)		748			—			748
	Total allowance for loan losses		$	5,000		$	500		$	5,500
	Allowance for Loan Losses, December 31, 2012
	Loans collectively evaluated for impairment		$	8,814		$	150		$	8,964
	Loans individually evaluated for impairment (1)		1,036			—			1,036
	Total allowance for loan losses		$	9,850		$	150		$	10,000
	Recorded Investment, September 30, 2013
	Loans collectively evaluated for impairment		$	4,860,122		$	422,681		$	5,282,803
	Loans individually evaluated for impairment (1)		18,530			—			18,530
	Total recorded investment		$	4,878,652		$	422,681		$	5,301,333
	Recorded Investment, December 31, 2012
	Loans collectively evaluated for impairment		$	4,871,579		$	183,399		$	5,054,978
	Loans individually evaluated for impairment (1)		16,817			—			16,817
	Total recorded investment		$	4,888,396		$	183,399		$	5,071,795
	(1)	The recorded investment in our MPP conventional loans individually evaluated for impairment excludes potential claims by servicers as of September 30, 2013 and December 31, 2012 for any losses resulting from past or future liquidations of the underlying properties on $11,195 and $15,665, respectively, of principal that was previously paid in full by the servicers. However, the MPP conventional loan allowance for loan losses includes $690 and $968 for these potential claims as of September 30, 2013 and December 31, 2012, respectively.
Recorded Investment in Delinquent Mortgage Loans [Table Text Block]	'
	The tables below present our key credit quality indicators for mortgage loans at September 30, 2013 and December 31, 2012:
			MPP						MPF
	Mortgage Loans Held for Portfolio as of September 30, 2013		Conventional			FHA			Conventional			Government			Total
	Past due 30-59 days		$	57,900		$	27,876		$	229		$	832		$	86,837
	Past due 60-89 days		17,743			8,873			—			166			26,782
	Past due 90 days or more		85,766			3,502			129			253			89,650
	Total past due		161,409			40,251			358			1,251			203,269
	Total current		4,717,243			742,455			422,323			103,301			5,985,322
	Total mortgage loans, recorded investment		4,878,652			782,706			422,681			104,552			6,188,591
	Net unamortized premiums		(71,190		)	(18,948		)	(8,930		)	(1,492		)	(100,560		)
	Hedging adjustments		(3,101		)	(791		)	713			(35		)	(3,214		)
	Accrued interest receivable		(18,340		)	(2,861		)	(1,830		)	(413		)	(23,444		)
	Total Mortgage Loans Held for Portfolio, UPB		$	4,786,021		$	760,106		$	412,634		$	102,612		$	6,061,373
	Other Delinquency Statistics as of September 30, 2013
	In process of foreclosure, included above (1)		$	52,541		$	—		$	—		$	—		$	52,541
	Serious delinquency rate (2)		1.76		%	0.45		%	0.03		%	0.24		%	1.45		%
	Past due 90 days or more still accruing interest (3)		$	85,363		$	3,502		$	—		$	253		$	89,118
	On non-accrual status		1,355			—			129			—			1,484
			MPP						MPF
	Mortgage Loans Held for Portfolio as of December 31, 2012		Conventional			FHA			Conventional			Government			Total
	Past due 30-59 days		$	63,797		$	36,522		$	293		$	78		$	100,690
	Past due 60-89 days		25,050			8,761			—			36			33,847
	Past due 90 days or more		104,984			3,440			1			—			108,425
	Total past due		193,831			48,723			294			114			242,962
	Total current		4,694,565			859,236			183,105			54,649			5,791,555
	Total mortgage loans, recorded investment		4,888,396			907,959			183,399			54,763			6,034,517
	Net unamortized premiums		(51,202		)	(17,990		)	(4,790		)	(1,534		)	(75,516		)
	Hedging adjustments		(7,958		)	(901		)	(819		)	(67		)	(9,745		)
	Accrued interest receivable		(18,967		)	(3,373		)	(586		)	(186		)	(23,112		)
	Total Mortgage Loans Held for Portfolio, UPB		$	4,810,269		$	885,695		$	177,204		$	52,976		$	5,926,144
	Other Delinquency Statistics as of December 31, 2012
	In process of foreclosure, included above (1)		$	75,317		$	—		$	—		$	—		$	75,317
	Serious delinquency rate (2)		2.15		%	0.38		%	—		%	—		%	1.8		%
	Past due 90 days or more still accruing interest (3)		$	104,805		$	3,440		$	1		$	—		$	108,246
	On non-accrual status		1,816			—			—			—			1,816
	(1)	Includes loans for which the decision of foreclosure or similar alternative, such as pursuit of deed-in-lieu of foreclosure, has been reported. Loans in process of foreclosure are included in past due categories depending on their delinquency status.
	(2)	Represents loans 90 days or more past due (including loans in process of foreclosure) expressed as a percentage of the total recorded investment in mortgage loans. The percentage excludes principal amounts that were previously paid in full by the servicers on conventional loans that are pending resolution of potential loss claims. Many FHA loans are repurchased by the servicers when they reach 90 days or more delinquent status, similar to the rules for servicers of Ginnie Mae MBS, resulting in the lower serious delinquency rate for FHA loans.
	(3)	Although our past due scheduled/scheduled MPP loans are classified as loans past due 90 days or more based on the mortgagor's payment status, we do not consider these loans to be non-accrual.
Performing and Non-performing Troubled Debt Restructurings [Table Text Block]	'
	The table below presents the recorded investment of the performing and non-performing troubled debt restructurings.
			September 30, 2013									December 31, 2012
	Recorded Investment		Performing			Non-Performing (1)			Total			Performing			Non-Performing (1)			Total
	MPP conventional loans		$	17,389		$	1,141		$	18,530		$	15,001		$	1,816		$	16,817
	(1)	Represents loans on non-accrual status only.
Troubled Debt Restructurings Recorded Investment Balance at Modification Date [Table Text Block]	'
	The tables below present the financial effect of the troubled debt restructurings for the three and nine months ended September 30, 2013 and 2012. The pre- and post-modification amounts represent the amount of recorded investment as of the date the loans were modified.
			Three Months Ended						Nine Months Ended
			September 30, 2013						September 30, 2013
	Troubled Debt Restructurings at Modification Date		Pre-Modification			Post-Modification (1)			Pre-Modification			Post-Modification (1)
	MPP conventional loans		$	767		$	802		$	4,060		$	4,306
			Three Months Ended						Nine Months Ended
			September 30, 2012						September 30, 2012
	Troubled Debt Restructurings at Modification Date		Pre-Modification			Post-Modification (1)			Pre-Modification			Post-Modification (1)
	MPP conventional loans		$	2,163		$	2,325		$	11,931		$	12,843
	(1)	Includes the capitalization of interest previously received under scheduled/scheduled payment terms.
Individually Evaluated Impaired Loan Statistics by Product Class Level [Table Text Block]	'
	The first table presents the recorded investment, UPB and related allowance associated with these loans while the next tables present the average recorded investment of individually impaired loans and related interest income recognized.
			September 30, 2013									December 31, 2012
	Individually Evaluated Impaired Loans		Recorded Investment			UPB			Related Allowance for Loan Losses			Recorded Investment			UPB			Related Allowance for Loan Losses
	MPP conventional loans without allowance for loan losses		$	17,389		$	17,222		$	—		$	15,001		$	14,892		$	—
	MPP conventional loans with allowance for loan losses		1,141			1,116			58			1,816			1,783			68
	Total		$	18,530		$	18,338		$	58		$	16,817		$	16,675		$	68
Impaired Financing Receivables [Table Text Block]	'
			Three Months Ended						Nine Months Ended
			September 30, 2013						September 30, 2013
	Individually Evaluated Impaired Loans		Average Recorded Investment			Interest Income Recognized			Average Recorded Investment			Interest Income Recognized
	MPP conventional loans without allowance for loan losses		$	17,447		$	253		$	16,396		$	708
	MPP conventional loans with allowance for loan losses		1,143			17			1,142			82
	Total		$	18,590		$	270		$	17,538		$	790
			Three Months Ended						Nine Months Ended
			September 30, 2012						September 30, 2012
	Individually Evaluated Impaired Loans		Average Recorded Investment			Interest Income Recognized			Average Recorded Investment			Interest Income Recognized
	MPP conventional loans without allowance for loan losses		$	11,438		$	182		$	6,975		$	377
	MPP conventional loans with allowance for loan losses		2,404			35			1,519			79
	Total		$	13,842		$	217		$	8,494		$	456

Derivative_and_Hedging_Activit1

Derivative and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Fair Value of Derivative Instruments [Table Text Block]	'
	The following table presents the notional amount and estimated fair value of derivative instruments. Over-the-counter derivative transactions may be either executed with a counterparty (bilateral derivatives) or cleared through a Futures Commission Merchant (i.e., clearing agent) with a Clearinghouse (cleared derivatives). Once a derivative transaction has been accepted for clearing by a Clearinghouse, the derivative transaction is novated and the executing counterparty is replaced with the Clearinghouse. The Clearinghouse notifies the clearing agent of the required initial and variation margin, and the clearing agent notifies us of the required initial and variation margin. For purposes of this disclosure, the derivative values include the related accrued interest.
			Notional Amount of Derivatives			Estimated Fair Value of			Estimated Fair Value of
						Derivative Assets			Derivative Liabilities
	September 30, 2013
	Derivatives designated as hedging instruments:
	Interest-rate swaps (1)		$	31,866,210		$	112,380		$	688,543
	Total derivatives designated as hedging instruments		31,866,210			112,380			688,543
	Derivatives not designated as hedging instruments:
	Interest-rate swaps		1,859,743			792			339
	Interest-rate caps/floors		340,500			1,194			—
	Interest-rate futures/forwards		104,300			—			2,479
	MDCs		101,983			1,247			—
	Total derivatives not designated as hedging instruments		2,406,526			3,233			2,818
	Total derivatives before adjustments		$	34,272,736		115,613			691,361
	Netting adjustments					(114,366		)	(114,366		)
	Cash collateral and related accrued interest					6,408			(389,761		)
	Total adjustments (2)					(107,958		)	(504,127		)
	Total derivatives, net					$	7,655		$	187,234
	December 31, 2012
	Derivatives designated as hedging instruments:
	Interest-rate swaps		$	32,158,474		$	71,297		$	951,216
	Total derivatives designated as hedging instruments		32,158,474			71,297			951,216
	Derivatives not designated as hedging instruments:
	Interest-rate swaps		1,214,179			757			233
	Interest-rate caps/floors		340,500			1,005			—
	Interest-rate futures/forwards		156,700			230			43
	MDCs		157,475			289			29
	Total derivatives not designated as hedging instruments		1,868,854			2,281			305
	Total derivatives before adjustments		$	34,027,328		73,578			951,521
	Netting adjustments					(72,757		)	(72,757		)
	Cash collateral and related accrued interest					—			(677,649		)
	Total adjustments (2)					(72,757		)	(750,406		)
	Total derivatives, net					$	821		$	201,115
	(1)	Includes all cleared derivatives.
	(2)	Amounts represent the application of the netting requirements that allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing agent and/or counterparty.
Credit Risk Exposure on Derivative Instruments [Table Text Block]	'
	30-Sep-13		Estimated Fair Value of Derivative Assets			Estimated Fair Value of Derivative Liabilities
	Derivative instruments meeting netting requirements:
	Gross recognized amount
	Bilateral derivatives		$	113,128		$	686,087
	Cleared derivatives		1,238			2,795
	Total gross recognized amount		114,366			688,882
	Gross amounts of netting adjustments and cash collateral
	Bilateral derivatives		(113,128		)	(501,332		)
	Cleared derivatives		5,170			(2,795		)
	Total gross amounts of netting adjustments and cash collateral		(107,958		)	(504,127		)
	Net amounts after netting adjustments and cash collateral
	Bilateral derivatives		—			184,755
	Cleared derivatives		6,408			—
	Total net amounts after netting adjustments and cash collateral		6,408			184,755
	Derivative instruments not meeting netting requirements (1)		1,247			2,479
	Total derivatives		$	7,655		$	187,234
	31-Dec-12		Estimated Fair Value of Derivative Assets			Estimated Fair Value of Derivative Liabilities
	Derivative instruments meeting netting requirements:
	Gross recognized amount		$	73,059		$	951,449
	Gross amounts of netting adjustments and cash collateral		(72,757		)	(750,406		)
	Net amounts after netting adjustments and cash collateral		302			201,043
	Derivative instruments not meeting netting requirements (1)		519			72
	Total derivatives		$	821		$	201,115
	(1)	Includes MDCs and certain interest-rate futures or forwards.
Components of Net Gains (Losses) on Derivatives and Hedging Activities [Table Text Block]	'
	The following table presents the components of Net Gains (Losses) on Derivatives and Hedging Activities reported in Other Income (Loss):
			Three Months Ended September 30,						Nine Months Ended September 30,
	Type of Hedge		2013			2012			2013			2012
	Net gain (loss) related to fair-value hedge ineffectiveness:
	Interest-rate swaps		$	(1,353	)	$	(1,973	)	$	8,596		$	(2,425	)
	Total net gain (loss) related to fair-value hedge ineffectiveness		(1,353		)	(1,973		)	8,596			(2,425		)
	Net gain (loss) on derivatives not designated as hedging instruments:
	Economic hedges:
	Interest-rate swaps		62			91			5,002			294
	Interest-rate caps/floors		(405		)	(301		)	189			(1,577		)
	Interest-rate futures/forwards		334			(6,054		)	6,119			(10,602		)
	Net interest settlements		194			(41		)	(4,063		)	(47		)
	MDCs		1,043			5,222			(5,172		)	6,914
	Total net gain (loss) on derivatives not designated as hedging instruments		1,228			(1,083		)	2,075			(5,018		)
	Net Gains (Losses) on Derivatives and Hedging Activities		$	(125	)	$	(3,056	)	$	10,671		$	(7,443	)
Effect of Fair Value Hedge-Related Derivative Instruments [Table Text Block]	'
	The following table presents, by type of hedged item, the gains (losses) on derivatives and the related hedged items in fair-value hedging relationships and the effect of those derivatives on Net Interest Income:
			Gain (Loss)			Gain (Loss)			Net Fair-				Effect on
			on			on Hedged			Value Hedge				Net Interest
	Three Months Ended September 30, 2013		Derivative			Item			Ineffectiveness				Income (1)
	Advances		$	(8,893	)	$	7,160		$	(1,733	)		$	(50,849	)
	AFS securities		3,694			(3,524		)	170				(21,524		)
	CO Bonds		15,723			(15,513		)	210				21,904
	Total		$	10,524		$	(11,877	)	$	(1,353	)		$	(50,469	)
	Three Months Ended September 30, 2012
	Advances		$	(18,727	)	$	17,638		$	(1,089	)		$	(58,171	)
	AFS securities		(15,789		)	16,087			298				(20,157		)
	CO Bonds		7,182			(8,364		)	(1,182		)		12,570
	Total		$	(27,334	)	$	25,361		$	(1,973	)		$	(65,758	)
	Nine Months Ended September 30, 2013
	Advances		$	197,316		$	(194,821	)	$	2,495			$	(160,667	)
	AFS securities		124,730			(122,879		)	1,851				(64,457		)
	CO Bonds		(97,336		)	101,586			4,250				67,238
	Total		$	224,710		$	(216,114	)	$	8,596			$	(157,886	)
	Nine Months Ended September 30, 2012
	Advances		$	(50,374	)	$	48,256		$	(2,118	)		$	(178,514	)
	AFS securities		(36,273		)	37,519			1,246				(55,995		)
	CO Bonds		19,118			(20,671		)	(1,553		)		42,397
	Total		$	(67,529	)	$	65,104		$	(2,425	)		$	(192,112	)
	(1)	The net interest on derivatives in fair-value hedging relationships is recorded in the Interest Income / Interest Expense line item of the respective hedged item, which results in fully offsetting amounts, except to the extent of any hedge ineffectiveness.

Deposits_Tables

Deposits (Tables)	9 Months Ended
	Sep. 30, 2013
Deposits [Abstract]	'
Summary of Deposits, by Type [Table Text Block]	'
	The following table presents Interest-Bearing and Non-Interest-Bearing Deposits:
	Type of Deposits		September 30,		December 31,
			2013		2012
	Interest-Bearing:
	Demand and overnight		$	834,605	$	704,216
	Time		3,000		2,250
	Other		22		22
	Total Interest-Bearing		837,627		706,488
	Non-Interest-Bearing:
	Demand (1)		254,601		1,066,041
	Other (2)		22,281		14,622
	Total Non-Interest Bearing		276,882		1,080,663
	Total Deposits		$	1,114,509	$	1,787,151
	(1)	Represents principal and interest custodial accounts transferred to our Bank by a member for GSE remittance payments.
	(2)	Includes pass-through deposit reserves from members.

Consolidated_Obligations_Table

Consolidated Obligations (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Discount Notes [Table Text Block]	'
	Our participation in Discount Notes, all of which are due within one year of issuance, was as follows:
	Discount Notes	September 30,			December 31,
		2013			2012
	Book value	$	7,804,773		$	8,924,085
	Par value	7,806,128			8,925,828
	Weighted average effective interest rate	0.1		%	0.15		%
CO Bonds Outstanding [Table Text Block]	'
	The following table presents our participation in CO Bonds outstanding:
		September 30, 2013						December 31, 2012
	Year of Contractual Maturity	Amount			WAIR%			Amount			WAIR%
	Due in 1 year or less	$	11,933,250		0.45			$	14,083,675		0.54
	Due after 1 year through 2 years	2,863,950			1.41			2,984,650			1.49
	Due after 2 years through 3 years	1,695,250			1.59			1,323,800			1.59
	Due after 3 years through 4 years	1,356,350			1.6			724,900			3.08
	Due after 4 years through 5 years	1,985,000			2.04			1,337,700			2.29
	Thereafter	7,821,800			2.86			6,881,450			3.11
	Total CO Bonds, par value	27,655,600			1.47			27,336,175			1.5
	Unamortized premiums	35,136						36,958
	Unamortized discounts	(16,188		)				(17,444		)
	Hedging adjustments	(51,428		)				51,841
	Total CO Bonds	$	27,623,120					$	27,407,530
CO Bonds by Redemption Feature [Table Text Block]	'
	The following tables present our participation in CO Bonds outstanding by redemption feature and contractual maturity or next call date:
	Redemption Feature	September 30,			December 31,
		2013			2012
	Non-callable / non-putable	$	18,129,600		$	19,952,175
	Callable	9,526,000			7,384,000
	Total CO Bonds, par value	$	27,655,600		$	27,336,175
CO Bonds by Contractual Maturity or Next Call Date [Table Text Block]	'
	Year of Contractual Maturity or Next Call Date	September 30,			December 31,
		2013			2012
	Due in 1 year or less	$	21,394,250		$	21,097,675
	Due after 1 year through 2 years	1,888,950			1,694,650
	Due after 2 years through 3 years	1,087,250			1,091,800
	Due after 3 years through 4 years	440,350			513,900
	Due after 4 years through 5 years	545,000			607,700
	Thereafter	2,299,800			2,330,450
	Total CO Bonds, par value	$	27,655,600		$	27,336,175

Affordable_Housing_Program_Tab

Affordable Housing Program (Tables)	9 Months Ended
	Sep. 30, 2013
Affordable Housing Program [Abstract]	'
Schedule of Activity in Affordable Housing Program Obligation [Table Text Block]	'
	The following table summarizes the activity in our AHP funding obligation:
			Three Months Ended September 30,						Nine Months Ended September 30,
	AHP Activity		2013			2012			2013			2012
	Balance at beginning of period		$	41,050		$	34,550		$	34,362		$	32,845
	Assessment (expense)		3,442			4,056			16,066			13,157
	Subsidy usage, net (1)		(4,718		)	(4,059		)	(10,654		)	(11,455		)
	Balance at end of period		$	39,774		$	34,547		$	39,774		$	34,547
	(1)	Subsidies disbursed are reported net of returns of previously disbursed subsidies.

Capital_Tables

Capital (Tables)	9 Months Ended
	Sep. 30, 2013
Capital [Abstract]	'
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	'
	As presented in the following table, we were in compliance with the Finance Agency's capital requirements at September 30, 2013 and December 31, 2012. For regulatory purposes, AOCI is not considered capital; MRCS, however, is considered capital.
		September 30, 2013						December 31, 2012
	Regulatory Capital Requirements	Required			Actual			Required			Actual
	Risk-based capital	$	743,626		$	2,625,924		$	636,022		$	2,676,616
	Regulatory permanent capital-to-asset ratio	4		%	6.64		%	4		%	6.49		%
	Regulatory permanent capital	$	1,583,073		$	2,625,924		$	1,649,105		$	2,676,616
	Leverage ratio	5		%	9.95		%	5		%	9.74		%
	Leverage capital	$	1,978,842		$	3,938,886		$	2,061,382		$	4,014,924
MRCS Activity [Table Text Block]	'
	The following table presents the activity in MRCS:
		Three Months Ended September 30,						Nine Months Ended September 30,
	MRCS Activity	2013			2012			2013			2012
	Balance at beginning of period	$	255,720		$	450,898		$	450,716		$	453,885
	Additions due to change in membership status	—			—			95,441			3,513
	Redemptions/repurchases	(401		)	(182		)	(290,975		)	(6,709		)
	Accrued dividends	—			—			137			27
	Balance at end of period	$	255,319		$	450,716		$	255,319		$	450,716
Schedule of Mandatorily Redeemable Capital Stock by Contractual Year of Redemption [Table Text Block]	'
	The following table presents the amount of MRCS by contractual year of redemption. The year of redemption in the table is the later of the end of the five-year redemption period or the maturity date of the activity to which the stock is related, if the stock represents the activity-based stock purchase requirement of a non-member (a former member that withdrew from membership, merged into a non-member or was otherwise acquired by a non-member).
	Contractual Year of Redemption	September 30,			December 31,
		2013			2012
	Year 1	$	147,130		$	268,512
	Year 2	502			144,644
	Year 3	8,733			20,511
	Year 4	3,513			13,536
	Year 5	95,441			3,513
	Total MRCS	$	255,319		$	450,716
Schedule of Distributions on Mandatorily Redeemable Capital Stock [Table Text Block]	'
	The following table presents the distributions on MRCS:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
	MRCS Distributions	2013			2012			2013			2012
	Recorded as Interest Expense	$	2,225		$	3,355		$	6,713		$	10,592
	Recorded as distributions from Retained Earnings	—			—			137			27
	Total	$	2,225		$	3,355		$	6,850		$	10,619

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Abstract]	'
Schedule of Changes in the Components of AOCI [Table Text Block]	'
	The following table presents a summary of the changes in the components of AOCI for the three and nine months ended September 30, 2013 and 2012:
	AOCI Rollforward	Unrealized Gains (Losses) on AFS Securities (Note 3)			Non-Credit OTTI on AFS Securities (Note 3)			Non-Credit OTTI on HTM Securities			Pension Benefits			Total AOCI
								(Note 4)			(Note 15)
	Balance, June 30, 2012	$	9,895		$	(79,157	)	$	(350	)	$	(10,098	)	$	(79,710	)
	Total Other Comprehensive Income (Loss)	3,606			35,626			18			(570		)	38,680
	Balance, September 30, 2012	$	13,501		$	(43,531	)	$	(332	)	$	(10,668	)	$	(41,030	)
	Balance, December 31, 2011	$	15,080		$	(119,274	)	$	(392	)	$	(8,955	)	$	(113,541	)
	Total Other Comprehensive Income (Loss)	(1,579		)	75,743			60			(1,713		)	72,511
	Balance, September 30, 2012	$	13,501		$	(43,531	)	$	(332	)	$	(10,668	)	$	(41,030	)
	Balance, June 30, 2013	$	475		$	15,425		$	(275	)	$	(11,698	)	$	3,927
	Other Comprehensive Income (Loss) before reclassifications:
	Net change in unrealized gains (losses)	2,392			2,474			—			—			4,866
	Net change in fair value	—			(84		)	—			—			(84		)
	Accretion of non-credit loss	—			—			18			—			18
	Reclassifications from OCI to Net Income
	Net (gains) losses on sold securities	—			—			—			—			—
	Net Other-Than-Temporary Impairment Losses, credit portion	—			—			—			—			—
	Compensation and Benefits	—			—			—			6,175			6,175
	Total Other Comprehensive Income (Loss)	2,392			2,390			18			6,175			10,975
	Balance, September 30, 2013	$	2,867		$	17,815		$	(257	)	$	(5,523	)	$	14,902
	Balance, December 31, 2012	$	12,335		$	(9,684	)	$	(312	)	$	(12,397	)	$	(10,058	)
	Other Comprehensive Income (Loss) before reclassifications:
	Net change in unrealized gains (losses)	(9,468		)	7,615			—			—			(1,853		)
	Net change in fair value	—			35,095			—			—			35,095
	Accretion of non-credit loss	—			—			55			—			55
	Reclassifications from OCI to Net Income
	Net (gains) losses on sold securities	—			(17,135		)	—			—			(17,135		)
	Net Other-Than-Temporary Impairment Losses, credit portion	—			1,924			—			—			1,924
	Compensation and Benefits	—			—			—			6,874			6,874
	Total Other Comprehensive Income (Loss)	(9,468		)	27,499			55			6,874			24,960
	Balance, September 30, 2013	$	2,867		$	17,815		$	(257	)	$	(5,523	)	$	14,902

Employee_Retirement_and_Deferr1

Employee Retirement and Deferred Compensation Plans (Tables)	9 Months Ended
	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'
Schedule of Net Periodic Benefit Costs [Table Text Block]	'
	Components of the net periodic benefit cost of our SERP were:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Net Periodic Benefit Cost
	Service cost	$	136		$	224		$	592		$	667
	Interest cost	112			205			520			611
	Amortization of prior service benefit	(3		)	(3		)	(8		)	(8		)
	Amortization of net actuarial loss (gain)	135			392			875			1,167
	Net periodic benefit cost	380			818			1,979			2,437
	Settlement loss	5,093			—			5,093			—
	Total expense recorded in Compensation and Benefits	5,473			818			7,072			2,437
	Net loss (income) recognized in OCI	(6,175		)	570			(6,874		)	1,713
	Total recognized in Compensation and Benefits and in OCI	$	(702	)	$	1,388		$	198		$	4,150

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Financial Performance by Operating Segment [Table Text Block]	'
	The following table presents our financial performance by operating segment:
		Three Months Ended									Nine Months Ended
	September 30, 2013	Traditional			Mortgage Loans			Total			Traditional			Mortgage Loans			Total
	Net Interest Income	$	34,486		$	17,640		$	52,126		$	112,715		$	60,418		$	173,133
	Provision for (Reversal of) Credit Losses	—			314			314			—			(3,451		)	(3,451		)
	Other Income (Loss)	(856		)	1,407			551			27,359			1,104			28,463
	Other Expenses	18,324			1,841			20,165			46,347			4,751			51,098
	Income Before Assessments	15,306			16,892			32,198			93,727			60,222			153,949
	Affordable Housing Program Assessments	1,753			1,689			3,442			10,044			6,022			16,066
	Net Income	$	13,553		$	15,203		$	28,756		$	83,683		$	54,200		$	137,883
	September 30, 2012
	Net Interest Income	$	40,841		$	18,241		$	59,082		$	124,488		$	56,860		$	181,348
	Provision for (Reversal of) Credit Losses	—			5,634			5,634			—			7,917			7,917
	Other Income (Loss)	(1,336		)	(832		)	(2,168		)	(4,967		)	(3,688		)	(8,655		)
	Other Expenses	12,771			1,311			14,082			39,928			3,873			43,801
	Income Before Assessments	26,734			10,464			37,198			79,593			41,382			120,975
	Affordable Housing Program Assessments	3,010			1,046			4,056			9,019			4,138			13,157
	Net Income	$	23,724		$	9,418		$	33,142		$	70,574		$	37,244		$	107,818
Schedule of Segment Assets by Segment [Table Text Block]	'
	The following table presents asset balances by segment:
	By Date	Traditional			Mortgage Loans			Total
	September 30, 2013	$	33,417,188		$	6,159,647		$	39,576,835
	December 31, 2012	35,226,231			6,001,405			41,227,636

Estimated_Fair_Values_Tables

Estimated Fair Values (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value, by Balance Sheet Grouping [Table Text Block]	'
	The following tables present the carrying value and estimated fair value of each of our financial assets and liabilities. The total of the estimated fair values does not represent an estimate of our overall market value as a going concern, which would take into account future business opportunities and the net profitability of assets and liabilities among other considerations.
			September 30, 2013
						Estimated Fair Value
			Carrying															Netting
	Financial Instruments		Value			Total			Level 1			Level 2			Level 3			Adjustment (1)
	Assets:
	Cash and Due from Banks		$	514,383		$	514,383		$	514,383		$	—		$	—		$	—
	Interest-Bearing Deposits		487			487			—			487			—			—
	Securities Purchased Under Agreements to Resell		2,700,000			2,700,000			—			2,700,000			—			—
	Federal Funds Sold		245,000			245,000			—			245,000			—			—
	AFS securities		3,688,783			3,688,783			—			3,200,214			488,569			—
	HTM securities		7,321,459			7,437,226			—			7,260,140			177,086			—
	Advances		18,796,297			18,900,794			—			18,900,794			—			—
	Mortgage Loans Held for Portfolio, net		6,159,647			6,305,330			—			6,256,720			48,610			—
	Accrued Interest Receivable		81,966			81,966			—			81,966			—			—
	Derivative Assets, net		7,655			7,655			—			115,613			—			(107,958		)
	Grantor Trust Assets (included in Other Assets)		12,061			12,061			12,061			—			—			—
	Liabilities:
	Deposits		1,114,509			1,114,509			—			1,114,509			—			—
	Consolidated Obligations:
	Discount Notes		7,804,773			7,806,128			—			7,806,128			—			—
	CO Bonds		27,623,120			27,710,117			—			27,710,117			—			—
	Accrued Interest Payable		94,866			94,866			—			94,866			—			—
	Derivative Liabilities, net		187,234			187,234			—			691,361			—			(504,127		)
	MRCS		255,319			255,319			255,319			—			—			—
			December 31, 2012
						Estimated Fair Value
			Carrying															Netting
	Financial Instruments		Value			Total			Level 1			Level 2			Level 3			Adjustment (1)
	Assets:
	Cash and Due from Banks		$	105,472		$	105,472		$	105,472		$	—		$	—		$	—
	Interest-Bearing Deposits		48			48			—			48			—			—
	Securities Purchased Under Agreements to Resell		3,250,000			3,250,000			—			3,250,000			—			—
	Federal Funds Sold		2,110,000			2,110,000			—			2,110,000			—			—
	AFS securities		3,980,580			3,980,580			—			3,340,438			640,142			—
	HTM securities		7,504,643			7,738,596			—			7,490,101			248,495			—
	Advances		18,129,458			18,298,372			—			18,298,372			—			—
	Mortgage Loans Held for Portfolio, net		6,001,405			6,318,983			—			6,265,990			52,993			—
	Accrued Interest Receivable		87,455			87,455			—			87,455			—			—
	Derivative Assets, net		821			821			—			73,578			—			(72,757		)
	Grantor Trust Assets (included in Other Assets)		18,440			18,440			18,440			—			—			—
	Liabilities:
	Deposits		1,787,151			1,787,151			—			1,787,151			—			—
	Consolidated Obligations:
	Discount Notes		8,924,085			8,925,828			—			8,925,828			—			—
	CO Bonds		27,407,530			28,162,392			—			28,162,392			—			—
	Accrued Interest Payable		87,777			87,777			—			87,777			—			—
	Derivative Liabilities, net		201,115			201,115			—			951,521			—			(750,406		)
	MRCS		450,716			450,716			450,716			—			—			—
	(1)	Amounts represent the application of the netting requirements that allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing agent and/or counterparty.
Estimated Fair Value on a Recurring Basis [Table Text Block]	'
	The following tables present by level within the fair value hierarchy the estimated fair value of our financial assets and liabilities that are recorded at estimated fair value on a recurring basis on our Statement of Condition. We did not have any financial assets or liabilities recorded at estimated fair value on a non-recurring basis on our Statement of Condition as of September 30, 2013 or December 31, 2012.
															Netting
	September 30, 2013		Total			Level 1			Level 2			Level 3			Adjustment (1)
	AFS securities:
	GSE and TVA debentures		$	3,200,214		$	—		$	3,200,214		$	—		$	—
	Private-label RMBS		488,569			—			—			488,569			—
	Total AFS securities		3,688,783			—			3,200,214			488,569			—
	Derivative Assets:
	Interest-rate related		6,408			—			114,366			—			(107,958		)
	Interest-rate futures/forwards		—			—			—			—			—
	MDCs		1,247			—			1,247			—			—
	Total Derivative Assets, net		7,655			—			115,613			—			(107,958		)
	Grantor Trust Assets (included in Other Assets)		12,061			12,061			—			—			—
	Total recurring assets at estimated fair value		$	3,708,499		$	12,061		$	3,315,827		$	488,569		$	(107,958	)
	Derivative Liabilities:
	Interest-rate related		$	184,755		$	—		$	688,882		$	—		$	(504,127	)
	Interest-rate futures/forwards		2,479			—			2,479			—			—
	MDCs		—			—			—			—			—
	Total Derivative Liabilities, net		187,234			—			691,361			—			(504,127		)
	Total recurring liabilities at estimated fair value		$	187,234		$	—		$	691,361		$	—		$	(504,127	)
	December 31, 2012
	AFS securities:
	GSE and TVA debentures		$	3,340,438		$	—		$	3,340,438		$	—		$	—
	Private-label RMBS		640,142			—			—			640,142			—
	Total AFS securities		3,980,580			—			3,340,438			640,142			—
	Derivative Assets:
	Interest-rate related		302			—			73,059			—			(72,757		)
	Interest-rate futures/forwards		230			—			230			—			—
	MDCs		289			—			289			—			—
	Total Derivative Assets, net		821			—			73,578			—			(72,757		)
	Grantor Trust Assets (included in Other Assets)		18,440			18,440			—			—			—
	Total recurring assets at estimated fair value		$	3,999,841		$	18,440		$	3,414,016		$	640,142		$	(72,757	)
	Derivative Liabilities:
	Interest-rate related		$	201,043		$	—		$	951,449		$	—		$	(750,406	)
	Interest-rate futures/forwards		43			—			43			—			—
	MDCs		29			—			29			—			—
	Total Derivative Liabilities, net		201,115			—			951,521			—			(750,406		)
	Total recurring liabilities at estimated fair value		$	201,115		$	—		$	951,521		$	—		$	(750,406	)
	(1)	Amounts represent the application of the netting requirements that allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing agent and/or counterparty.
Reconciliation of AFS Private-label RMBS Measured at Estimated Fair Value on a Recurring Basis using Level 3 Significant Inputs [Table Text Block]	'
	The table below presents a rollforward of our AFS private-label RMBS measured at estimated fair value on a recurring basis using Level 3 significant inputs. The estimated fair values for the private-label RMBS were valued using a pricing source, such as a dealer quote or comparable security price, for which the significant unobservable inputs used to determine the price were not reasonably available.
			Three Months Ended September 30,						Nine Months Ended September 30,
	Level 3 Rollforward		2013			2012			2013			2012
	Balance, beginning of period		$	511,952		$	602,975		$	640,142		$	601,309
	Total realized and unrealized gains (losses):
	Accretion of credit losses in Net Interest Income		37			89			95			644
	Net gains (losses) on changes in fair value in Other Income (Loss)		—			(14		)	—			(3,592		)
	Net change in fair value not in excess of cumulative non-credit losses in OCI		(84		)	32,311			12,625			64,096
	Unrealized gains (losses) in OCI		2,474			3,301			16,843			8,055
	Reclassification of non-credit portion in OCI to Other Income (Loss)		—			14			—			3,592
	Purchases, issuances, sales and settlements:
	Settlements		(25,810		)	(17,735		)	(56,957		)	(53,163		)
	Transfers out		—			—			(124,179		)	—
	Balance, end of period		$	488,569		$	620,941		$	488,569		$	620,941
	Net gains (losses) included in earnings attributable to changes in fair value relating to assets still held at end of period		$	37		$	75		$	95		$	(2,948	)

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Off-Balance Sheet Commitments [Table Text Block]	'
	The following table presents our off-balance-sheet commitments at their notional amounts:
			September 30, 2013
	By Commitment		Expire within one year		Expire after one year		Total
	Standby letters of credit outstanding		$	112,594	$	153,433	$	266,027
	Unused lines of credit		793,552		—		793,552
	Commitments to fund additional Advances (1)		20,550		—		20,550
	Commitments to fund or purchase mortgage loans and participation interests		101,983		—		101,983
	Unsettled CO Bonds, at par (2)		1,010,000		—		1,010,000
	(1)	Commitments to fund additional Advances are generally for periods up to six months and include no outstanding commitments to issue standby letters of credit.
	(2)	Unsettled CO Bonds of $1,000,000 were hedged with associated interest-rate swaps.

Transactions_with_Related_Part1

Transactions with Related Parties (Tables)	9 Months Ended
	Sep. 30, 2013
Related Parties Holding 10% or more of our Capital Stock and MRCS [Member]	'
Related Party Transaction [Line Items]	'
Outstanding Balances with Respect to Transactions with Related Parties [Table Text Block]	'
	The following table presents the outstanding balances with respect to transactions with related parties and their balance as a percent of the total balance on our Statement of Condition.
			Capital Stock, including MRCS					Advances							Mortgage Loans Held for Portfolio (2)
	September 30, 2013		Balance,		% of Total			Balance,				% of Total			UPB		% of Total
			par value					par value
	Flagstar Bank, FSB		$	301,737	16	%		$	2,907,598			16	%		$	554,658	9	%
	Total (1)		$	301,737	16	%		$	2,907,598			16	%		$	554,658	9	%
	December 31, 2012
	Flagstar Bank, FSB		$	301,737	14	%		$	3,180,000			18	%		$	656,931	11	%
	Bank of America, N.A. (former member)		224,921		11	%		300,000				2	%		1,210,009		20	%
	Total		$	526,658	25	%		$	3,480,000			20	%		$	1,866,940	31	%
	(1)	Bank of America, N.A. did not meet the definition of a related party as of September 30, 2013 as a result of our repurchase of excess stock in February 2013.
	(2)	Represents UPB of mortgage loans purchased from related party.
Net Advances to (Repayments from) Related Parties [Table Text Block]	'
	During the three and nine months ended September 30, 2013 and 2012, we had net Advances to (repayments from) related parties as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	Related Party		2013		2012				2013				2012
	Flagstar Bank, FSB		$	7,598	$	(312,000	)		$	(272,402	)		$	(865,000	)
	Bank of America, N.A. (former member) (1)		—		—				—				(100,000		)
	(1)	Bank of America, N.A. did not meet the definition of a related party following our repurchase of excess stock in February 2013.
Directors' Financial Institutions [Member]	'
Related Party Transaction [Line Items]	'
Outstanding Balances with Respect to Transactions with Related Parties [Table Text Block]	'
	The following table presents the outstanding balances with respect to transactions with directors' financial institutions and their balance as a percent of the total balance on our Statement of Condition.
			Capital Stock, including MRCS					Advances							Mortgage Loans Held for Portfolio (1)
	Date		Balance,		% of Total			Balance,				% of Total			UPB		% of Total
			par value					par value
	September 30, 2013		$	42,842	2	%		$	238,815			1	%		$	78,774	1	%
	December 31, 2012		74,114		4	%		462,758				3	%		74,235		1	%
	(1)	Represents UPB of mortgage loans purchased from Directors' Financial Institutions.
Net Advances to (Repayments from) Related Parties [Table Text Block]	'
	During the three and nine months ended September 30, 2013 and 2012, net Advances to (repayments from) directors' financial institutions and mortgage loans acquired from directors' financial institutions, taking into account the dates of the directors' appointments and resignations, were as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	Transactions with Directors' Financial Institutions		2013		2012				2013				2012
	Net Advances (repayments)		$	13,678	$	(18,931	)		$	(108,340	)		$	(21,717	)
	Mortgage loans acquired		8,110		12,515				21,271				24,854

AvailableforSale_Securities_Na

Available-for-Sale Securities (Narrative) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Apr. 04, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified			Private-Label RMBS [Member]	Private-Label RMBS [Member]
			Security	Security
Available-for-sale Securities [Line Items]	'	'	'	'
Net unamortized discounts on OTTI securities	$68,584	$110,664	'	'
Number of AFS securities sold	'	'	6	6
Number of AFS securities sold in unrealized loss position	'	'	'	1

AvailableforSale_Securities_Ma

Available-for-Sale Securities (Major Security Types) (Details) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Available-for-sale Securities [Line Items]	'		'
Amortized Cost	$3,668,101	[1]	$3,977,929	[1]
Non-Credit OTTI	-242		-20,126
Gross Unrealized Gains	26,703		23,449
Gross Unrealized Losses	-5,779		-672
Available-for-Sale Securities (Notes 3 and 5)	3,688,783		3,980,580
GSE and TVA debentures [Member]	'		'
Available-for-sale Securities [Line Items]	'		'
Amortized Cost	3,197,347	[1]	3,328,103	[1]
Non-Credit OTTI	0		0
Gross Unrealized Gains	8,646		13,007
Gross Unrealized Losses	-5,779		-672
Available-for-Sale Securities (Notes 3 and 5)	3,200,214		3,340,438
Private-Label RMBS [Member]	'		'
Available-for-sale Securities [Line Items]	'		'
Amortized Cost	470,754	[1]	649,826	[1]
Non-Credit OTTI	-242		-20,126
Gross Unrealized Gains	18,057		10,442
Gross Unrealized Losses	0		0
Available-for-Sale Securities (Notes 3 and 5)	$488,569		$640,142
[1]	Amortized cost of AFS securities includes adjustments made to the cost basis of an investment for accretion, amortization, collection of principal, and, if applicable, OTTI recognized in earnings (credit losses) and fair-value hedge accounting adjustments.

AvailableforSale_Securities_Un

Available-for-Sale Securities (Unrealized Loss Positions) (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Estimated Fair Value	$998,420	$398,265
Less than 12 Months, Unrealized Losses	-5,779	-672
12 Months or More, Estimated Fair Value	7,719	471,359
12 Months or More, Unrealized Losses	-242	-20,126
Total Estimated Fair Value	1,006,139	869,624
Total Unrealized Losses	-6,021	-20,798
GSE and TVA debentures [Member]	'	'
Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Estimated Fair Value	998,420	398,265
Less than 12 Months, Unrealized Losses	-5,779	-672
12 Months or More, Estimated Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Estimated Fair Value	998,420	398,265
Total Unrealized Losses	-5,779	-672
Private-Label RMBS [Member]	'	'
Available-for-sale Securities [Line Items]	'	'
Less than 12 Months, Estimated Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or More, Estimated Fair Value	7,719	471,359
12 Months or More, Unrealized Losses	-242	-20,126
Total Estimated Fair Value	7,719	471,359
Total Unrealized Losses	($242)	($20,126)

AvailableforSale_Securities_Re

Available-for-Sale Securities (Redemption Terms) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Available-for-sale Securities [Line Items]	'	'
Amortized Cost Basis	$3,668,101	$3,977,929
Estimated Fair Value	3,688,783	3,980,580
Non-MBS [Member]	'	'
Available-for-sale Securities [Line Items]	'	'
Due in One Year or Less, Amortized Cost	0	0
Due in One Year or Less, Estimated Fair Value	0	0
Due after One Year Through Five Years, Amortized Cost	2,040,424	2,038,791
Due after One Year Through Five Years, Estimated Fair Value	2,048,487	2,048,429
Due after Five Years Through Ten Years, Amortized Cost	1,123,231	1,197,884
Due after Five Years Through Ten Years, Estimated Fair Value	1,118,511	1,200,979
Due after Ten Years, Amortized Cost	33,692	91,428
Due after Ten Years, Estimated Fair Value	33,216	91,030
Amortized Cost Basis	3,197,347	3,328,103
Estimated Fair Value	3,200,214	3,340,438
MBS [Member]	'	'
Available-for-sale Securities [Line Items]	'	'
Amortized Cost Basis	470,754	649,826
Estimated Fair Value	$488,569	$640,142

AvailableforSale_Securities_Re1

Available-for-Sale Securities (Realized Gains and Losses) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Available-for-sale Securities [Abstract]	'	'	'	'
Proceeds from sale	$0	$0	$129,471	$0
Previously recognized OTTI credit losses including accretion	0	0	38,806	0
Gross realized gains	0	0	17,135	0
Gross realized losses	0	0	0	0
Net Realized Gains from Sale of Available-for-Sale Securities	$0	$0	$17,135	$0

HeldtoMaturity_Securities_Majo

Held-to-Maturity Securities (Major Security Types) (Details) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]	'		'
Amortized Cost	$7,321,716	[1]	$7,504,955	[1]
Non-Credit OTTI	-257		-312
Carrying Value	7,321,459	[2]	7,504,643	[2]
Gross Unrecognized Holding Gains	136,027	[3]	240,567	[3]
Gross Unrecognized Holding Losses	-20,260	[3]	-6,614	[3]
Estimated Fair Value	7,437,226		7,738,596
GSE Debentures [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Amortized Cost	268,998	[1]	268,996	[1]
Non-Credit OTTI	0		0
Carrying Value	268,998	[2]	268,996	[2]
Gross Unrecognized Holding Gains	663	[3]	357	[3]
Gross Unrecognized Holding Losses	0	[3]	0	[3]
Estimated Fair Value	269,661		269,353
Non-MBS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Carrying Value	268,998	[2]	268,996	[2]
Estimated Fair Value	269,661		269,353
Other US Obligations - Guaranteed RMBS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Amortized Cost	3,090,243	[1]	3,123,784	[1]
Non-Credit OTTI	0		0
Carrying Value	3,090,243	[2]	3,123,784	[2]
Gross Unrecognized Holding Gains	53,058	[3]	84,169	[3]
Gross Unrecognized Holding Losses	-11,493	[3]	-1,345	[3]
Estimated Fair Value	3,131,808		3,206,608
GSE RMBS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Amortized Cost	3,781,786	[1]	3,859,172	[1]
Non-Credit OTTI	0		0
Carrying Value	3,781,786	[2]	3,859,172	[2]
Gross Unrecognized Holding Gains	81,713	[3]	155,044	[3]
Gross Unrecognized Holding Losses	-4,828	[3]	-76	[3]
Estimated Fair Value	3,858,671		4,014,140
Private-Label RMBS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Amortized Cost	165,093	[1]	235,778	[1]
Non-Credit OTTI	0		0
Carrying Value	165,093	[2]	235,778	[2]
Gross Unrecognized Holding Gains	488	[3]	992	[3]
Gross Unrecognized Holding Losses	-1,802	[3]	-2,577	[3]
Estimated Fair Value	163,779		234,193
Manufactured Housing Loan ABS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Amortized Cost	13,410	[1]	14,779	[1]
Non-Credit OTTI	0		0
Carrying Value	13,410	[2]	14,779	[2]
Gross Unrecognized Holding Gains	0	[3]	0	[3]
Gross Unrecognized Holding Losses	-2,010	[3]	-2,276	[3]
Estimated Fair Value	11,400		12,503
Home Equity Loan ABS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Amortized Cost	2,186	[1]	2,446	[1]
Non-Credit OTTI	-257		-312
Carrying Value	1,929	[2]	2,134	[2]
Gross Unrecognized Holding Gains	105	[3]	5	[3]
Gross Unrecognized Holding Losses	-127	[3]	-340	[3]
Estimated Fair Value	1,907		1,799
MBS and ABS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Amortized Cost	7,052,718	[1]	7,235,959	[1]
Non-Credit OTTI	-257		-312
Carrying Value	7,052,461	[2]	7,235,647	[2]
Gross Unrecognized Holding Gains	135,364	[3]	240,210	[3]
Gross Unrecognized Holding Losses	-20,260	[3]	-6,614	[3]
Estimated Fair Value	$7,167,565		$7,469,243
[1]	Amortized cost includes adjustments made to the cost basis of an investment for accretion, amortization, collection of principal, and, if applicable, OTTI recognized in earnings (credit losses).
[2]	Carrying value of HTM securities represents amortized cost after adjustment for non-credit OTTI recognized in AOCI.
[3]	Gross unrecognized holding gains (losses) represents the difference between estimated fair value and carrying value.

HeldtoMaturity_Securities_Unre

Held-to-Maturity Securities (Unrealized Loss Position) (Details) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]	'		'
Less than 12 Months, Estimated Fair Value	$2,822,028		$406,267
Less than 12 Months, Unrealized Losses	-12,850		-544
12 Months or More, Estimated Fair Value	521,246		630,105
12 Months or More, Unrealized Losses	-7,562		-6,377
Total Estimated Fair Value	3,343,274		1,036,372
Total Unrealized Losses	-20,412	[1]	-6,921	[1]
Other US Obligations - Guaranteed RMBS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Less than 12 Months, Estimated Fair Value	1,415,791		274,784
Less than 12 Months, Unrealized Losses	-7,734		-432
12 Months or More, Estimated Fair Value	435,953		460,152
12 Months or More, Unrealized Losses	-3,759		-913
Total Estimated Fair Value	1,851,744		734,936
Total Unrealized Losses	-11,493	[1]	-1,345	[1]
GSE RMBS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Less than 12 Months, Estimated Fair Value	1,357,575		124,225
Less than 12 Months, Unrealized Losses	-4,805		-76
12 Months or More, Estimated Fair Value	7,590		0
12 Months or More, Unrealized Losses	-23		0
Total Estimated Fair Value	1,365,165		124,225
Total Unrealized Losses	-4,828	[1]	-76	[1]
Private-Label RMBS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Less than 12 Months, Estimated Fair Value	48,662		7,258
Less than 12 Months, Unrealized Losses	-311		-36
12 Months or More, Estimated Fair Value	64,397		155,651
12 Months or More, Unrealized Losses	-1,491		-2,541
Total Estimated Fair Value	113,059		162,909
Total Unrealized Losses	-1,802	[1]	-2,577	[1]
Manufactured Housing Loan ABS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Less than 12 Months, Estimated Fair Value	0		0
Less than 12 Months, Unrealized Losses	0		0
12 Months or More, Estimated Fair Value	11,399		12,503
12 Months or More, Unrealized Losses	-2,010		-2,276
Total Estimated Fair Value	11,399		12,503
Total Unrealized Losses	-2,010	[1]	-2,276	[1]
Home Equity Loan ABS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Less than 12 Months, Estimated Fair Value	0		0
Less than 12 Months, Unrealized Losses	0		0
12 Months or More, Estimated Fair Value	1,907		1,799
12 Months or More, Unrealized Losses	-279		-647
Total Estimated Fair Value	1,907		1,799
Total Unrealized Losses	-279	[1]	-647	[1]
MBS and ABS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Less than 12 Months, Estimated Fair Value	2,822,028		406,267
Less than 12 Months, Unrealized Losses	-12,850		-544
12 Months or More, Estimated Fair Value	521,246		630,105
12 Months or More, Unrealized Losses	-7,562		-6,377
Total Estimated Fair Value	3,343,274		1,036,372
Total Unrealized Losses	($20,412)	[1]	($6,921)	[1]
[1]	Total unrealized losses on home equity loan ABS will not agree to total gross unrecognized holding losses. Total unrealized losses include non-credit-related OTTI losses recorded in AOCI and gross unrecognized holding gains on previously OTTI securities.

HeldtoMaturity_Securities_Rede

Held-to-Maturity Securities (Redemption Terms)(Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]	'		'
Amortized Cost	$7,321,716	[1]	$7,504,955	[1]
Carrying Value	7,321,459	[2]	7,504,643	[2]
Estimated Fair Value	7,437,226		7,738,596
Manufactured Housing Loan ABS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Carrying Value	13,410	[2]	14,779	[2]
Estimated Fair Value	11,400		12,503
Non-MBS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Due in One Year or Less, Amortized Cost	0	[1]	0	[1]
Due in One Year or Less, Carrying Value	0	[2]	0	[2]
Due in One Year or Less, Estimated Fair Value	0		0
Due After One Year Through Five Years, Amortized Cost	268,998	[1]	268,996	[1]
Due After One Year Through Five Years, Carrying Value	268,998	[2]	268,996	[2]
Due After One Year Through Five Years, Estimated Fair Value	269,661		269,353
Due After Five Through Ten Years, Amortized Cost	0	[1]	0	[1]
Due After Five Through Ten Years, Carrying Value	0	[2]	0	[2]
Due After Five Through Ten Years, Estimated Fair Value	0		0
Due After Ten Years, Amortized Cost	0	[1]	0	[1]
Due After Ten Years, Carrying Value	0	[2]	0	[2]
Due After Ten Years, Estimated Fair Value	0		0
Amortized Cost	268,998	[1]	268,996	[1]
Carrying Value	268,998	[2]	268,996	[2]
Estimated Fair Value	269,661		269,353
MBS and ABS [Member]	'		'
Schedule of Held-to-maturity Securities [Line Items]	'		'
Amortized Cost	7,052,718		7,235,959	[1]
Carrying Value	7,052,461	[2]	7,235,647	[2]
Estimated Fair Value	$7,167,565		$7,469,243
[1]	Amortized cost includes adjustments made to the cost basis of an investment for accretion, amortization, collection of principal, and, if applicable, OTTI recognized in earnings (credit losses).
[2]	Carrying value of HTM securities represents amortized cost after adjustment for non-credit OTTI recognized in AOCI.

HeldtoMaturity_Securities_Narr

Held-to-Maturity Securities (Narratives) (Details) (MBS and ABS [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
MBS and ABS [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Net premiums	$47,662	$51,784

OtherThanTemporary_Impairments2

Other-Than-Temporary Impairments Analysis (Rollforward of the Cumulative Credit Losses) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
			Security
Other Than Temporary Impairments Analysis [Abstract]	'	'	'	'
OTTI credit charge	'	'	$1,924	'
Number of security changed previous intention to hold until recovery of amortized cost	'	'	1	'
Credit loss recognized in earnings as a result of calculations using the significant modeling assumptions	'	14	0	3,594
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]	'	'	'	'
Balance at Beginning of Period	72,287	109,214	109,169	105,636
Additions:	'	'	'	'
Additional credit losses for which OTTI was previously recognized	0	14	1,924	3,594
Reductions:	'	'	'	'
Credit losses on securities sold, matured, paid down or prepaid	0	0	-30,506	-2
Unamortized life-to-date credit losses on security that we intend to sell before recovery of its amortized cost basis	0	0	-8,300	0
Balance at End of Period	$72,287	$109,228	$72,287	$109,228

OtherThanTemporary_Impairments3

Other-Than-Temporary Impairments Analysis (Securities with OTTI Losses) (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Held-to-maturity Securities [Member]	'
Other than Temporary Impairment, Disclosure [Line Items]	'
OTTI Life-to-Date, UPB	$920
OTTI Life-to-Date, Amortized Cost	884
OTTI Life-to-Date, Carrying Value	627
OTTI Life-to-Date, Estimated Fair Value	732
Available-for-sale Securities [Member]	'
Other than Temporary Impairment, Disclosure [Line Items]	'
OTTI Life-to-Date, UPB	539,339
OTTI Life-to-Date, Amortized Cost	470,754
OTTI Life-to-Date, Estimated Fair Value	488,569
Prime [Member] | Held-to-maturity Securities [Member] | Private-Label RMBS [Member]	'
Other than Temporary Impairment, Disclosure [Line Items]	'
OTTI Life-to-Date, UPB	0
OTTI Life-to-Date, Amortized Cost	0
OTTI Life-to-Date, Carrying Value	0
OTTI Life-to-Date, Estimated Fair Value	0
Prime [Member] | Available-for-sale Securities [Member] | Private-Label RMBS [Member]	'
Other than Temporary Impairment, Disclosure [Line Items]	'
OTTI Life-to-Date, UPB	539,339
OTTI Life-to-Date, Amortized Cost	470,754
OTTI Life-to-Date, Estimated Fair Value	488,569
Alt-A [Member] | Held-to-maturity Securities [Member] | Private-Label RMBS [Member]	'
Other than Temporary Impairment, Disclosure [Line Items]	'
OTTI Life-to-Date, UPB	0
OTTI Life-to-Date, Amortized Cost	0
OTTI Life-to-Date, Carrying Value	0
OTTI Life-to-Date, Estimated Fair Value	0
Alt-A [Member] | Available-for-sale Securities [Member] | Private-Label RMBS [Member]	'
Other than Temporary Impairment, Disclosure [Line Items]	'
OTTI Life-to-Date, UPB	0
OTTI Life-to-Date, Amortized Cost	0
OTTI Life-to-Date, Estimated Fair Value	0
Subprime [Member] | Held-to-maturity Securities [Member] | Home Equity Loan ABS [Member]	'
Other than Temporary Impairment, Disclosure [Line Items]	'
OTTI Life-to-Date, UPB	920
OTTI Life-to-Date, Amortized Cost	884
OTTI Life-to-Date, Carrying Value	627
OTTI Life-to-Date, Estimated Fair Value	732
Subprime [Member] | Available-for-sale Securities [Member] | Home Equity Loan ABS [Member]	'
Other than Temporary Impairment, Disclosure [Line Items]	'
OTTI Life-to-Date, UPB	0
OTTI Life-to-Date, Amortized Cost	0
OTTI Life-to-Date, Estimated Fair Value	$0

Advances_Details

Advances (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Advances [Line Items]	'	'
Callable Federal Home Loan Bank Advances	$3,700,000,000	$3,700,000,000
Redemption Terms [Abstract]	'	'
Overdrawn demand and overnight deposit accounts, Amount	17,000	15,004,000
Overdrawn demand and overnight deposit accounts,WAIR %	2.50%	2.50%
Due in 1 year or less, Amount	4,184,443,000	3,761,551,000
Due in 1 year or less, WAIR %	0.67%	1.57%
Due after 1 year through 2 years, Amount	2,019,963,000	1,365,251,000
Due after 1 year through 2 years, WAIR %	2.56%	2.66%
Due after 2 years through 3 years, Amount	3,832,451,000	2,287,033,000
Due after 2 years through 3 years, WAIR %	2.40%	3.11%
Due after 3 years through 4 years, Amount	2,969,219,000	3,435,097,000
Due after 3 years through 4 years. WAIR %	2.35%	2.61%
Due after 4 years through 5 years, Amount	2,027,387,000	2,448,083,000
Due after 4 years through 5 years, WAIR %	2.23%	2.22%
Thereafter, Amount	3,332,013,000	4,070,200,000
Thereafter, WAIR %	2.04%	2.49%
Total Advances, par value	18,365,493,000	17,382,219,000
Total Advances, WAIR %	1.93%	2.38%
Unamortized discounts (including AHP)	-3,220,000	-1,284,000
Hedging adjustments	323,670,000	577,225,000
Unamortized swap termination fees associated with modified Advances	110,354,000	171,298,000
Total Advances	18,796,297,000	18,129,458,000
Advances by the Earlier of Contractual Maturity or Next Call Date or Next Put Date [Abstract]	'	'
Overdrawn demand and overnight deposit accounts	17,000	15,004,000
Year of Contractual Maturity or Next Call Date, Due in 1 year or less	6,544,808,000	5,800,961,000
Year of Contractual Maturity or Next Put Date, Due in 1 year or less	4,382,443,000	4,070,551,000
Year of Contractual Maturity or Next Call Date, Due after 1 year through 2 years	1,996,713,000	1,348,251,000
Year of Contractual Maturity or Next Put Date, Due after 1 year through 2 years	2,010,463,000	1,327,251,000
Year of Contractual Maturity or Next Call Date, Due after 2 years through 3 years	3,896,451,000	2,163,783,000
Year of Contractual Maturity or Next Put Date, Due after 2 years through 3 years	3,803,451,000	2,250,533,000
Year of Contractual Maturity or Next Call Date, Due after 3 years through 4 years	2,736,469,000	3,539,097,000
Year of Contractual Maturity or Next Put Date, Due after 3 years through 4 years	2,879,719,000	3,405,097,000
Year of Contractual Maturity or Next Call Date, Due after 4 years through 5 years	1,812,387,000	2,310,333,000
Year of Contractual Maturity or Next Put Date, Due after 4 years through 5 years	1,977,387,000	2,328,583,000
Year of Contractual Maturity or Next Call Date, Thereafter	1,378,648,000	2,204,790,000
Year of Contractual Maturity or Next Put Date, Thereafter	$3,312,013,000	$3,985,200,000
Minimum [Member]	'	'
Advances [Line Items]	'	'
Interest rate of advances outstanding	0.00%	'
Maximum [Member]	'	'
Advances [Line Items]	'	'
Interest rate of advances outstanding	8.34%	'

Advances_Narratives_Details

Advances (Narratives) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
	Borrower		Borrower		Borrower
Advances [Abstract]	'	'	'	'	'
Callable Federal Home Loan Bank Advances	$3,700,000,000	'	$3,700,000,000	'	$3,700,000,000
Putable advances outstanding	204,000,000	'	204,000,000	'	351,500,000
Convertible Advances outstanding	0	'	0	'	0
Prepayment fees	273,000	5,067,000	31,114,000	12,737,000	'
Gross advance prepayment fee deferred in the period	197,000	17,973,000	12,132,000	44,864,000	'
Advances outstanding, at par, to single borrowers with balances that were greater than or equal to $1.0 billion	8,000,000,000	'	8,000,000,000	'	8,400,000,000
Advances to borrowers holding in excess of $1.0 billion per borrower, at par value, percentage of advances outstanding	44.00%	'	44.00%	'	48.00%
Number of borrowers holding in excess of $1.0 billion per borrower	4	'	4	'	5
UPB of collateral to cover the Advances to these institutions	$15,200,000,000	'	$15,200,000,000	'	$17,900,000,000

Mortgage_Loans_Held_for_Portfo2

Mortgage Loans Held for Portfolio (Details) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

In Thousands, unless otherwise specified

Conventional [Member]

Conventional [Member]

Conventional [Member]

Conventional [Member]

Conventional [Member]

Conventional [Member]

Government [Member]

Government [Member]

Fixed-rate Medium-term Mortgages [Member]

Fixed-rate Medium-term Mortgages [Member]

Fixed-rate Medium-term Mortgages [Member]

Fixed-rate Long-term Mortgages [Member]

Fixed-rate Long-term Mortgages [Member]

Fixed-rate Long-term Mortgages [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

Maximum [Member]

Minimum [Member]

Conventional [Member]

Conventional [Member]

Conventional [Member]

Conventional [Member]

Conventional [Member]

Conventional [Member]

Government [Member]

Government [Member]

Fixed-rate Medium-term Mortgages [Member]

Fixed-rate Medium-term Mortgages [Member]

Fixed-rate Long-term Mortgages [Member]

Fixed-rate Long-term Mortgages [Member]

Conventional [Member]

Conventional [Member]

Conventional [Member]

Conventional [Member]

Conventional [Member]

Conventional [Member]

Government [Member]

Government [Member]

Fixed-rate Medium-term Mortgages [Member]

Fixed-rate Medium-term Mortgages [Member]

Fixed-rate Long-term Mortgages [Member]

Fixed-rate Long-term Mortgages [Member]

Mortgage Loans on Real Estate [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgage Loans Held for Portfolio, UPB

$6,061,373

$5,926,144

$5,198,655

'

$4,987,473

'

'

'

$862,718

$938,671

$1,109,818

[1]

$1,001,958

[1]

'

$4,951,555

[2]

$4,924,186

[2]

'

$5,546,127

$5,695,964

$4,786,021

'

$4,810,269

'

'

'

$760,106

$885,695

$1,026,871

[1]

$960,944

[1]

$4,519,256

[2]

$4,735,020

[2]

$515,246

$230,180

$412,634

'

$177,204

'

'

'

$102,612

$52,976

$82,947

[1]

$41,014

[1]

$432,299

[2]

$189,166

[2]

Unamortized premiums

112,861

87,782

'

'

'

'

'

'

'

'

'

'

'

'

'

'

102,325

81,459

'

'

'

'

'

'

'

'

'

'

'

'

10,536

6,323

'

'

'

'

'

'

'

'

'

'

'

'

Unamortized discounts

-12,301

-12,266

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-12,187

-12,266

'

'

'

'

'

'

'

'

'

'

'

'

-114

0

'

'

'

'

'

'

'

'

'

'

'

'

Hedging adjustments

3,214

9,745

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,891

8,859

3,101

'

7,958

'

'

'

'

'

'

'

'

'

-677

886

-713

'

819

'

'

'

35

67

'

'

'

'

Allowance for loan losses

-5,500

-10,000

-5,500

-5,500

-10,000

-10,000

-5,000

-3,300

'

'

'

'

'

'

'

'

-5,000

-9,850

-5,000

-5,000

-9,850

-9,975

-5,000

-3,300

'

'

'

'

'

'

-500

-150

-500

-500

-150

-25

0

0

'

'

'

'

'

'

Mortgage Loans Held for Portfolio, net

$6,159,647

$6,001,405

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$5,635,156

$5,764,166

'

'

'

'

'

'

'

'

'

'

'

'

$524,491

$237,239

'

'

'

'

'

'

'

'

'

'

'

'

Original term

'

'

'

'

'

'

'

'

'

'

'

'

'15 years

'

'

'15 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Medium-term is defined as a term of 15 years or less at origination.

[2]

Long-term is defined as a term greater than 15 years at origination.

Allowance_for_Credit_Losses_Cr

Allowance for Credit Losses (Credit Enhancements) (Details) (USD $)

9 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Dec. 31, 2011

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Jun. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Dec. 31, 2011

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPP [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

MPF [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

Conventional Loan [Member]

PMI [Member]

PMI [Member]

LRA [Member]

LRA [Member]

SMI [Member]

SMI [Member]

PMI and SMI [Member]

PMI and SMI [Member]

Financing Receivable, Allowance for Credit Losses [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reduction of recovery estimates associated with the expected amount of our claims for several providers

'

'

'

'

'

'

'

'

'

'

'

$1,685

'

$6,067

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated losses remaining after borrower's equity, before credit enhancements

'

'

'

'

'

'

'

'

'

'

'

35,963

'

51,465

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Portion of estimated losses recoverable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-4,977

-6,494

-5,216

-7,750

-22,455

-33,438

'

'

'

'

'

'

'

'

'

'

Allowance for unrecoverable credit enhancement fee

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,685

6,067

'

'

'

'

'

'

'

'

Allowance for loan losses

5,500

'

10,000

5,500

5,500

10,000

10,000

5,000

3,300

5,000

9,850

5,000

5,000

9,850

9,975

5,000

3,300

'

'

'

'

'

'

'

'

500

150

500

500

150

25

0

0

Credit Enhancement Fund [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance of LRA, beginning of period

33,693

23,408

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additions

12,555

13,017

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Claim paid

-2,422

-6,165

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Distributions

-761

-634

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance of LRA, end of period

43,065

29,626

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exposure under FLA

3,104

'

1,157

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CE Obligations available to cover losses in excess of the FLA

24,429

'

8,607

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

FLA loss reduction

$153

'

$67

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Allowance_for_Credit_Losses_MP

Allowance for Credit Losses (MPF Credit Enhancement Fees) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Receivables [Abstract]	'	'	'	'
Gross credit enhancement paid to participating financing institutions	$90	$1	$207	$1
Performance-based CE fees recovered from Participating Financial Institutions	0	0	0	0
Credit Enhancement Fee Paid to Participating Financing Institutions, Net	$90	$1	$207	$1

Allowance_for_Credit_Losses_Al

Allowance for Credit Losses (Allowance) (Details) (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]	'		'	'		'	'
Allowance for loan losses on mortgage loans, beginning of period	'		'	$10,000		'	'
Provision for (Reversal of) Credit Losses	314		5,634	-3,451		7,917	'
Allowance for loan losses on mortgage loans, end of period	5,500		'	5,500		'	'
Total allowance for loan losses	5,500		'	5,500		'	'
Total recorded investment	6,188,591		'	6,188,591		'	6,034,517
Conventional Loan [Member]	'		'	'		'	'
Allowance for Loan and Lease Losses [Roll Forward]	'		'	'		'	'
Allowance for loan losses on mortgage loans, beginning of period	5,500		5,000	10,000		3,300	'
Charge-offs	-314		-634	-1,049		-1,217	'
Provision for (Reversal of) Credit Losses	314		5,634	-3,451		7,917	'
Allowance for loan losses on mortgage loans, end of period	5,500		10,000	5,500		10,000	'
Allowance for loan losses, loans collectively evaluated for impairment	4,752		'	4,752		'	8,964
Allowance for loan losses, loans individually evaluated for impairment	748	[1]	'	748	[1]	'	1,036	[1]
Total allowance for loan losses	5,500		10,000	5,500		10,000	'
Recorded Investment, loans collectively evaluated for impairment	5,282,803		'	5,282,803		'	5,054,978
Recorded Investment, loans individually evaluated for impairment	18,530	[1]	'	18,530	[1]	'	16,817	[1]
Total recorded investment	5,301,333		'	5,301,333		'	5,071,795
Principal paid in full by servicers	11,195		'	11,195		'	15,665
Potential claims included in allowance	690		'	690		'	968
MPP [Member]	'		'	'		'	'
Allowance for Loan and Lease Losses [Roll Forward]	'		'	'		'	'
Allowance for loan losses on mortgage loans, beginning of period	'		'	'		'	9,850
Allowance for loan losses on mortgage loans, end of period	5,000		'	5,000		'	9,850
Total allowance for loan losses	5,000		'	5,000		'	9,850
MPP [Member] | Conventional Loan [Member]	'		'	'		'	'
Allowance for Loan and Lease Losses [Roll Forward]	'		'	'		'	'
Allowance for loan losses on mortgage loans, beginning of period	5,000		5,000	9,850		3,300	'
Charge-offs	-314		-634	-1,049		-1,217	'
Provision for (Reversal of) Credit Losses	314		5,609	-3,801		7,892	'
Allowance for loan losses on mortgage loans, end of period	5,000		9,975	5,000		9,975	'
Allowance for loan losses, loans collectively evaluated for impairment	4,252		'	4,252		'	8,814
Allowance for loan losses, loans individually evaluated for impairment	748	[1]	'	748	[1]	'	1,036	[1]
Total allowance for loan losses	5,000		9,975	5,000		9,975	'
Recorded Investment, loans collectively evaluated for impairment	4,860,122		'	4,860,122		'	4,871,579
Recorded Investment, loans individually evaluated for impairment	18,530	[1]	'	18,530	[1]	'	16,817	[1]
Total recorded investment	4,878,652		'	4,878,652		'	4,888,396
MPF [Member]	'		'	'		'	'
Allowance for Loan and Lease Losses [Roll Forward]	'		'	'		'	'
Allowance for loan losses on mortgage loans, beginning of period	'		'	'		'	150
Allowance for loan losses on mortgage loans, end of period	500		'	500		'	150
Total allowance for loan losses	500		'	500		'	150
MPF [Member] | Conventional Loan [Member]	'		'	'		'	'
Allowance for Loan and Lease Losses [Roll Forward]	'		'	'		'	'
Allowance for loan losses on mortgage loans, beginning of period	500		0	150		0	'
Charge-offs	0		0	0		0	'
Provision for (Reversal of) Credit Losses	0		25	350		25	'
Allowance for loan losses on mortgage loans, end of period	500		25	500		25	'
Allowance for loan losses, loans collectively evaluated for impairment	500		'	500		'	150
Allowance for loan losses, loans individually evaluated for impairment	0	[1]	'	0	[1]	'	0	[1]
Total allowance for loan losses	500		25	500		25	'
Recorded Investment, loans collectively evaluated for impairment	422,681		'	422,681		'	183,399
Recorded Investment, loans individually evaluated for impairment	0	[1]	'	0	[1]	'	0	[1]
Total recorded investment	$422,681		'	$422,681		'	$183,399
[1]	The recorded investment in our MPP conventional loans individually evaluated for impairment excludes potential claims by servicers as of SeptemberB 30, 2013 and DecemberB 31, 2012 for any losses resulting from past or future liquidations of the underlying properties on $11,195 and $15,665, respectively, of principal that was previously paid in full by the servicers. However, the MPP conventional loan allowance for loan losses includes $690 and $968 for these potential claims as of SeptemberB 30, 2013 and DecemberB 31, 2012, respectively.

Allowance_for_Credit_Losses_Pa

Allowance for Credit Losses (Past Due) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]	'		'
Past due 30-59 days delinquent	$86,837		$100,690
Past due 60-89 days delinquent	26,782		33,847
Past due 90 days or more delinquent	89,650		108,425
Total past due	203,269		242,962
Total current	5,985,322		5,791,555
Total recorded investment	6,188,591		6,034,517
Net unamortized premiums	-100,560		-75,516
Hedging adjustments	-3,214		-9,745
Accrued interest receivable	-23,444		-23,112
Mortgage Loans Held for Portfolio, UPB	6,061,373		5,926,144
In process of foreclosure, included above	52,541	[1]	75,317	[1]
Serious delinquency rate	1.45%	[2]	1.80%	[2]
Past due 90 days or more still accruing interest	89,118	[3]	108,246	[3]
On non-accrual status	1,484		1,816
Delinquent loan receivable (in days)	'90 days		'
Conventional [Member]	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Total recorded investment	5,301,333		5,071,795
Mortgage Loans Held for Portfolio, UPB	5,198,655		4,987,473
Government [Member]	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Mortgage Loans Held for Portfolio, UPB	862,718		938,671
MPP [Member]	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Hedging adjustments	-3,891		-8,859
Mortgage Loans Held for Portfolio, UPB	5,546,127		5,695,964
MPP [Member] | Conventional [Member]	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Past due 30-59 days delinquent	57,900		63,797
Past due 60-89 days delinquent	17,743		25,050
Past due 90 days or more delinquent	85,766		104,984
Total past due	161,409		193,831
Total current	4,717,243		4,694,565
Total recorded investment	4,878,652		4,888,396
Net unamortized premiums	-71,190		-51,202
Hedging adjustments	-3,101		-7,958
Accrued interest receivable	-18,340		-18,967
Mortgage Loans Held for Portfolio, UPB	4,786,021		4,810,269
In process of foreclosure, included above	52,541	[1]	75,317	[1]
Serious delinquency rate	1.76%	[2]	2.15%	[2]
Past due 90 days or more still accruing interest	85,363	[3]	104,805	[3]
On non-accrual status	1,355		1,816
MPP [Member] | FHA Loans [Member]	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Past due 30-59 days delinquent	27,876		36,522
Past due 60-89 days delinquent	8,873		8,761
Past due 90 days or more delinquent	3,502		3,440
Total past due	40,251		48,723
Total current	742,455		859,236
Total recorded investment	782,706		907,959
Net unamortized premiums	-18,948		-17,990
Hedging adjustments	-791		-901
Accrued interest receivable	-2,861		-3,373
Mortgage Loans Held for Portfolio, UPB	760,106		885,695
In process of foreclosure, included above	0	[1]	0	[1]
Serious delinquency rate	0.45%	[2]	0.38%	[2]
Past due 90 days or more still accruing interest	3,502	[3]	3,440	[3]
On non-accrual status	0		0
MPP [Member] | Government [Member]	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Mortgage Loans Held for Portfolio, UPB	760,106		885,695
MPF [Member]	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Hedging adjustments	677		-886
Mortgage Loans Held for Portfolio, UPB	515,246		230,180
MPF [Member] | Conventional [Member]	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Past due 30-59 days delinquent	229		293
Past due 60-89 days delinquent	0		0
Past due 90 days or more delinquent	129		1
Total past due	358		294
Total current	422,323		183,105
Total recorded investment	422,681		183,399
Net unamortized premiums	-8,930		-4,790
Hedging adjustments	713		-819
Accrued interest receivable	-1,830		-586
Mortgage Loans Held for Portfolio, UPB	412,634		177,204
In process of foreclosure, included above	0	[1]	0	[1]
Serious delinquency rate	0.03%	[2]	0.00%	[2]
Past due 90 days or more still accruing interest	0	[3]	1	[3]
On non-accrual status	129		0
MPF [Member] | Government [Member]	'		'
Financing Receivable, Recorded Investment [Line Items]	'		'
Past due 30-59 days delinquent	832		78
Past due 60-89 days delinquent	166		36
Past due 90 days or more delinquent	253		0
Total past due	1,251		114
Total current	103,301		54,649
Total recorded investment	104,552		54,763
Net unamortized premiums	-1,492		-1,534
Hedging adjustments	-35		-67
Accrued interest receivable	-413		-186
Mortgage Loans Held for Portfolio, UPB	102,612		52,976
In process of foreclosure, included above	0	[1]	0	[1]
Serious delinquency rate	0.24%	[2]	0.00%	[2]
Past due 90 days or more still accruing interest	253	[3]	0	[3]
On non-accrual status	$0		$0
[1]	Includes loans for which the decision of foreclosure or similar alternative, such as pursuit of deed-in-lieu of foreclosure, has been reported. Loans in process of foreclosure are included in past due categories depending on their delinquency status.
[2]	Represents loans 90 days or more past due (including loans in process of foreclosure) expressed as a percentage of the total recorded investment in mortgage loans. The percentage excludes principal amounts that were previously paid in full by the servicers on conventional loans that are pending resolution of potential loss claims. Many FHA loans are repurchased by the servicers when they reach 90 days or more delinquent status, similar to the rules for servicers of Ginnie Mae MBS, resulting in the lower serious delinquency rate for FHA loans.
[3]	Although our past due scheduled/scheduled MPP loans are classified as loans past due 90 days or more based on the mortgagor's payment status, we do not consider these loans to be non-accrual.

Allowance_for_Credit_Losses_Tr

Allowance for Credit Losses (Troubled Debt Restructuring) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Financing Receivable, Modifications [Line Items]	'		'		'		'		'
Period of time principal or interest past due to have defaulted on troubled debt restructuring	'		'		'60 days		'		'
Recorded investment of loans modified as troubled debt restructurings that subsequently default	$366		$1,013		$911		$3,751		'
MPP [Member] | Conventional [Member]	'		'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'		'
Financing Receivable, Modifications, Recorded Investment, Performing	17,389		'		17,389		'		15,001
Financing Receivable, Modifications, Recorded Investment, Non-Performing	1,141	[1]	'		1,141	[1]	'		1,816	[1]
Recorded Investment	18,530		'		18,530		'		16,817
Pre-Modification Recorded Investment	767		2,163		4,060		11,931		'
Post-Modification Recorded Investment	$802	[2]	$2,325	[2]	$4,306	[2]	$12,843	[2]	'
[1]	Represents loans on non-accrual status only.
[2]	Includes the capitalization of interest previously received under scheduled/scheduled payment terms.

Allowance_for_Credit_Losses_Im

Allowance for Credit Losses (Impaired Debt) (Details) (MPP [Member], Conventional [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
MPP [Member] | Conventional [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Conventional loans without allowance for loan losses, Recorded Investment	$17,389	'	$17,389	'	$15,001
Conventional loans with allowance for loan losses, Recorded Investment	1,141	'	1,141	'	1,816
Total recorded investment	18,530	'	18,530	'	16,817
Conventional loans without allowance for loan losses, UPB	17,222	'	17,222	'	14,892
Conventional loans with allowance for loan losses, UPB	1,116	'	1,116	'	1,783
Total UPB	18,338	'	18,338	'	16,675
Allowance for loan losses	58	'	58	'	68
Conventional Loans without Allowance, Average Recorded Investment	17,447	11,438	16,396	6,975	'
Conventional Loans without Allowance, Interest Income Recognized	253	182	708	377	'
Conventional Loans with Allowance, Average Recorded Investment	1,143	2,404	1,142	1,519	'
Conventional Loans with Allowance, Interest Income Recognized	17	35	82	79	'
Impaired Financing Receivable, Average Recorded Investment	18,590	13,842	17,538	8,494	'
Impaired Financing Receivable, Interest Income, Accrual Method	$270	$217	$790	$456	'

Derivative_and_Hedging_Activit2

Derivative and Hedging Activities (Derivatives in Statement of Condition) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'		'
Fair Value of Derivative Assets Designated as Hedging Instruments	$112,380		$71,297
Fair Value of Derivative Liabilities Designated as Hedging Instruments	688,543		951,216
Fair Value of Derivatives Assets Not Designated as Hedging Instruments	3,233		2,281
Fair Value of Derivatives Liabilities Not Designated as Hedging Instruments	2,818		305
Notional Amount of Derivatives	34,272,736		34,027,328
Fair Value of Derivative Assets, Total derivatives before adjustments	115,613		73,578
Fair Value of Derivative Liabilities, Total derivatives before adjustments	691,361		951,521
Derivative Asset, Netting adjustments	-114,366		-72,757
Derivative Liability, Netting adjustments	-114,366		-72,757
Derivative Asset, Cash Collateral and Related Accrued Interest	6,408		0
Derivative Liability, Cash Collateral and Related Accrued Interest	-389,761		-677,649
Derivative Asset, Total adjustments	-107,958	[1]	-72,757	[1]
Derivative Liability, Total adjustments	-504,127	[1]	-750,406	[1]
Derivative Asset, net	7,655		821
Derivative Liability, net	187,234		201,115
Interest Rate Swaps [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Fair Value of Derivative Assets Designated as Hedging Instruments	112,380	[2]	71,297
Fair Value of Derivative Liabilities Designated as Hedging Instruments	688,543	[2]	951,216
Fair Value of Derivatives Assets Not Designated as Hedging Instruments	792		757
Fair Value of Derivatives Liabilities Not Designated as Hedging Instruments	339		233
Interest Rate Caps / Floors [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Fair Value of Derivatives Assets Not Designated as Hedging Instruments	1,194		1,005
Fair Value of Derivatives Liabilities Not Designated as Hedging Instruments	0		0
Interest Rate Futures / Forwards [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Fair Value of Derivatives Assets Not Designated as Hedging Instruments	0		230
Fair Value of Derivatives Liabilities Not Designated as Hedging Instruments	2,479		43
Mortgage Delivery Commitments [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Fair Value of Derivatives Assets Not Designated as Hedging Instruments	1,247		289
Fair Value of Derivatives Liabilities Not Designated as Hedging Instruments	0		29
Designated as Hedging Instrument [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount of Derivatives	'		32,158,474
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount of Derivatives	31,866,210	[2]	32,158,474
Not Designated as Hedging Instrument [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount of Derivatives	2,406,526		1,868,854
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount of Derivatives	1,859,743		1,214,179
Not Designated as Hedging Instrument [Member] | Interest Rate Caps / Floors [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount of Derivatives	340,500		340,500
Not Designated as Hedging Instrument [Member] | Interest Rate Futures / Forwards [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount of Derivatives	104,300		156,700
Not Designated as Hedging Instrument [Member] | Mortgage Delivery Commitments [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount of Derivatives	101,983		157,475
Designated as Hedging Instrument [Member]	'		'
Derivatives, Fair Value [Line Items]	'		'
Notional Amount of Derivatives	$31,866,210		'
[1]	Amounts represent the application of the netting requirements that allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing agent and/or counterparty.
[2]	Includes all cleared derivatives.

Derivative_and_Hedging_Activit3

Derivative and Hedging Activities (Credit Risk Exposure) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative Instruments and Hedging Activities Disclosures [Line Items]	'		'
Derivative Asset, Gross amounts of netting adjustments and cash collateral	($107,958)	[1]	($72,757)	[1]
Derivative Liability, Gross amounts of netting adjustments and cash collateral	-504,127	[1]	-750,406	[1]
Derivative Liability Subject to Master Netting Arrangement	688,882		951,449
Derivative Asset Subject to Master Netting Arrangement	114,366		73,059
Derivative Asset, Amount Offset Against Collateral and Netting	-107,958		'
Derivative Liability, Amount Offset Against Collateral and Netting	-504,127		'
Derivative Asset, Net amounts after offsetting adjustment	6,408		302
Derivative Liability, Net amounts after offsetting adjustment	184,755		201,043
Derivative Asset, Not Subject to Master Netting Arrangement	1,247	[2]	519	[2]
Derivative Liability, Not Subject to Master Netting Arrangement	2,479	[2]	72	[2]
Derivative Assets	7,655		821
Derivative Liabilities	187,234		201,115
Over the Counter [Member]	'		'
Derivative Instruments and Hedging Activities Disclosures [Line Items]	'		'
Derivative Asset, Gross amounts of netting adjustments and cash collateral	113,128		'
Derivative Liability, Gross amounts of netting adjustments and cash collateral	686,087		'
Derivative Asset, Amount Offset Against Collateral and Netting	-113,128		'
Derivative Liability, Amount Offset Against Collateral and Netting	-501,332		'
Derivative Asset, Net Fair Value Amount, After Offsetting Adjustment	0		'
Derivative Liability, Net Fair Value Amount, After Offsetting Adjustment	184,755		'
Exchange Cleared [Member]	'		'
Derivative Instruments and Hedging Activities Disclosures [Line Items]	'		'
Derivative Liability Subject to Master Netting Arrangement	2,795		'
Derivative Asset Subject to Master Netting Arrangement	1,238		'
Derivative Asset, Amount Offset Against Collateral and Netting	5,170		'
Derivative Liability, Amount Offset Against Collateral and Netting	-2,795		'
Derivative Asset, Net Fair Value Amount, After Offsetting Adjustment	6,408		'
Derivative Liability, Net Fair Value Amount, After Offsetting Adjustment	$0		'
[1]	Amounts represent the application of the netting requirements that allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing agent and/or counterparty.
[2]	Includes MDCs and certain interest-rate futures or forwards.

Derivative_and_Hedging_Activit4

Derivative and Hedging Activities (Derivatives in Statement of Income) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total net gain (loss) related to fair-value hedge ineffectiveness	($1,353)	($1,973)	$8,596	($2,425)
Total net gain (loss) on derivatives not designated as hedging instruments	1,228	-1,083	2,075	-5,018
Net Gains (Losses) on Derivatives and Hedging Activities	-125	-3,056	10,671	-7,443
Interest Rate Swaps [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total net gain (loss) related to fair-value hedge ineffectiveness	-1,353	-1,973	8,596	-2,425
Total net gain (loss) on derivatives not designated as hedging instruments	62	91	5,002	294
Interest Rate Caps / Floors [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total net gain (loss) on derivatives not designated as hedging instruments	-405	-301	189	-1,577
Interest Rate Futures / Forwards [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total net gain (loss) on derivatives not designated as hedging instruments	334	-6,054	6,119	-10,602
Net Interest Settlements [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total net gain (loss) on derivatives not designated as hedging instruments	194	-41	-4,063	-47
Mortgage Delivery Commitments [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total net gain (loss) on derivatives not designated as hedging instruments	$1,043	$5,222	($5,172)	$6,914

Derivative_and_Hedging_Activit5

Derivative and Hedging Activities (Derivatives in Statement of Income and Impact on Interest) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Gain (Loss) on Derivatives	$10,524		($27,334)		$224,710		($67,529)
Gain (Loss) on Hedged Item	-11,877		25,361		-216,114		65,104
Net Fair Value Hedge Ineffectiveness	-1,353		-1,973		8,596		-2,425
Effect on Net Interest Income	-50,469	[1]	-65,758	[1]	-157,886	[1]	-192,112	[1]
Advances [Member]	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Gain (Loss) on Derivatives	-8,893		-18,727		197,316		-50,374
Gain (Loss) on Hedged Item	7,160		17,638		-194,821		48,256
Net Fair Value Hedge Ineffectiveness	-1,733		-1,089		2,495		-2,118
Effect on Net Interest Income	-50,849	[1]	-58,171	[1]	-160,667	[1]	-178,514	[1]
AFS Securities [Member]	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Gain (Loss) on Derivatives	3,694		-15,789		124,730		-36,273
Gain (Loss) on Hedged Item	-3,524		16,087		-122,879		37,519
Net Fair Value Hedge Ineffectiveness	170		298		1,851		1,246
Effect on Net Interest Income	-21,524	[1]	-20,157	[1]	-64,457	[1]	-55,995	[1]
CO Bonds [Member]	'		'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'		'
Gain (Loss) on Derivatives	15,723		7,182		-97,336		19,118
Gain (Loss) on Hedged Item	-15,513		-8,364		101,586		-20,671
Net Fair Value Hedge Ineffectiveness	210		-1,182		4,250		-1,553
Effect on Net Interest Income	$21,904	[1]	$12,570	[1]	$67,238	[1]	$42,397	[1]
[1]	The net interest on derivatives in fair-value hedging relationships is recorded in the Interest Income / Interest Expense line item of the respective hedged item, which results in fully offsetting amounts, except to the extent of any hedge ineffectiveness.

Derivative_and_Hedging_Activit6

Derivative and Hedging Activities (Narrative) (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative, Net Liability Position, Aggregate Fair Value	$572,958
Collateral Already Posted, Aggregate Fair Value	389,004
Derivative, Net Liability Position, Aggregate Fair Value, Not Subject to Credit Support Agreement	2,479
Additional Collateral, Aggregate Fair Value	$41,304

Deposits_Details

Deposits (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Interest-Bearing:	'		'
Demand and overnight	$834,605		$704,216
Time	3,000		2,250
Other	22		22
Total Interest-Bearing	837,627		706,488
Non-Interest-Bearing:	'		'
Demand	254,601	[1]	1,066,041	[1]
Other	22,281	[2]	14,622	[2]
Total Non-Interest Bearing	276,882		1,080,663
Total Deposits	$1,114,509		$1,787,151
[1]	Represents principal and interest custodial accounts transferred to our Bank by a member for GSE remittance payments.
[2]	Includes pass-through deposit reserves from members.

Consolidated_Obligations_Detai

Consolidated Obligations (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
	Bank
Schedule of Short-term and Long-term Debt [Line Items]	'	'
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due in One Year or Less	$11,933,250,000	$14,083,675,000
Federal Home Loan Bank, Consolidated Obligations, Bonds	27,623,120,000	27,407,530,000
Federal Home Loan Bank, Consolidated Obligations, Discount Notes	7,804,773,000	8,924,085,000
Number of Federal Home Loan Banks	12	'
Discount Notes maturity period	'1 year	'
CO Bonds [Abstract]	'	'
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due in Year Two	2,863,950,000	2,984,650,000
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due in Year Three	1,695,250,000	1,323,800,000
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due in Year Four	1,356,350,000	724,900,000
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due in Year Five	1,985,000,000	1,337,700,000
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due After Year Five	7,821,800,000	6,881,450,000
CO Bonds [Member]	'	'
CO Bonds [Abstract]	'	'
Due in 1 year or less, WAIR %	0.45%	0.54%
Due after 1 year through 2 years, WAIR %	1.41%	1.49%
Due after 2 years through 3 years, WAIR %	1.59%	1.59%
Due after 3 years through 4 years, WAIR %	1.60%	3.08%
Due after 4 years through 5 years, WAIR %	2.04%	2.29%
Thereafter, WAIR %	2.86%	3.11%
Total WAIR%	1.47%	1.50%
Unamortized premiums	35,136,000	36,958,000
Unamortized discounts	-16,188,000	-17,444,000
Hedging adjustments	-51,428,000	51,841,000
Earlier of Contractual Maturity or Next Call Date [Member]	'	'
Schedule of Short-term and Long-term Debt [Line Items]	'	'
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due in One Year or Less	21,394,250,000	21,097,675,000
CO Bonds [Abstract]	'	'
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due in Year Two	1,888,950,000	1,694,650,000
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due in Year Three	1,087,250,000	1,091,800,000
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due in Year Four	440,350,000	513,900,000
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due in Year Five	545,000,000	607,700,000
Federal Home Loan Bank, Consolidated Obligations, Bonds, Due After Year Five	2,299,800,000	2,330,450,000
Non Callable / Non Putable [Member]	'	'
Schedule of Short-term and Long-term Debt [Line Items]	'	'
Federal Home Loan Bank, Consolidated Obligations, Bonds	18,129,600,000	19,952,175,000
Callable [Member]	'	'
Schedule of Short-term and Long-term Debt [Line Items]	'	'
Federal Home Loan Bank, Consolidated Obligations, Bonds	9,526,000,000	7,384,000,000
Discount Notes [Member]	'	'
Discount Note [Abstract]	'	'
Weighted average effective interest rate	0.10%	0.15%
FHLBanks [Member]	'	'
CO Bonds [Abstract]	'	'
Debt, Gross	720,700,000,000	687,900,000,000
Par Value [Member]	'	'
Schedule of Short-term and Long-term Debt [Line Items]	'	'
Federal Home Loan Bank, Consolidated Obligations, Bonds	27,655,600,000	27,336,175,000
Federal Home Loan Bank, Consolidated Obligations, Discount Notes	7,806,128,000	8,925,828,000
Carrying Value [Member]	'	'
Schedule of Short-term and Long-term Debt [Line Items]	'	'
Federal Home Loan Bank, Consolidated Obligations, Bonds	27,623,120,000	27,407,530,000
Federal Home Loan Bank, Consolidated Obligations, Discount Notes	$7,804,773,000	$8,924,085,000

Affordable_Housing_Program_Det

Affordable Housing Program (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Affordable Housing Program Funding Obligation [Roll Forward]	'		'		'		'
Balance at beginning of period	$41,050		$34,550		$34,362		$32,845
Assessment (expense)	3,442		4,056		16,066		13,157
Subsidy usage, net	-4,718	[1]	-4,059	[1]	-10,654	[1]	-11,455	[1]
Balance at end of period	$39,774		$34,547		$39,774		$34,547
[1]	Subsidies disbursed are reported net of returns of previously disbursed subsidies.

Capital_Details

Capital (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
	Member		Member		Institution
	Institution		Institution		Member
Regulatory Capital Requirements [Abstract]	'	'	'	'	'
Risk-based capital, Required	$743,626	'	$743,626	'	$636,022
Risk-based capital, Actual	2,625,924	'	2,625,924	'	2,676,616
Regulatory permanent capital-to-asset ratio, Required	4.00%	'	4.00%	'	4.00%
Regulatory permanent capital-to-asset ratio, Actual	6.64%	'	6.64%	'	6.49%
Regulatory permanent capital, Required	1,583,073	'	1,583,073	'	1,649,105
Regulatory permanent capital, Actual	2,625,924	'	2,625,924	'	2,676,616
Leverage ratio, Required	5.00%	'	5.00%	'	5.00%
Leverage ratio, Actual	9.95%	'	9.95%	'	9.74%
Leverage capital, Required	1,978,842	'	1,978,842	'	2,061,382
Leverage capital, Actual	3,938,886	'	3,938,886	'	4,014,924
Mandatorily Redeemable Capital Stock Acitvity [Roll Forward]	'	'	'	'	'
Balance at beginning of period	255,720	450,898	450,716	453,885	'
Additions due to change in membership status	0	0	95,441	3,513	'
Redemptions/repurchases	-401	-182	-290,975	-6,709	'
Accrued dividends	0	0	137	27	'
Balance at end of period	255,319	450,716	255,319	450,716	'
Number of former members holding MRCS	17	'	17	'	27
Number of institutions acquired by FDIC holding MRCS	0	'	0	'	8
Mandatorily redeemable capital stock repurchased	'	'	614	'	'
Intended repurchase of excess stock held, par value	'	'	250,000	'	'
Mandatorily Redeemable Capital Stock, by Contractual Year of Redemption [Abstract]	'	'	'	'	'
Year 1	147,130	'	147,130	'	268,512
Year 2	502	'	502	'	144,644
Year 3	8,733	'	8,733	'	20,511
Year 4	3,513	'	3,513	'	13,536
Year 5	95,441	'	95,441	'	3,513
Total MRCS	255,319	450,716	255,319	450,716	'
Recorded as Interest Expense	-2,225	-3,355	-6,713	-10,592	'
Recorded as distributions from Retained Earnings	0	0	137	27	'
Total	2,225	3,355	6,850	10,619	'
Excess and Surplus Capital Stock [Abstract]	'	'	'	'	'
Excess Capital to Assets Allowed	1.00%	'	1.00%	'	'
Excess Capital	733,988	'	733,988	'	'
Excess Capital to Assets	1.90%	'	1.90%	'	'
Member or former members [Member]	'	'	'	'	'
Mandatorily Redeemable Capital Stock Acitvity [Roll Forward]	'	'	'	'	'
Intended repurchase of excess stock held, par value	'	'	250,000	'	'
Additional excess stock redeemed	'	'	$40,975	'	'
Stock repurchase redemption period	'	'	'5 years	'	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
AOCI Balance, Beginning	'	'	($10,058)	'
Net change in fair value	-84	32,311	35,095	64,096
Accretion of non-credit loss	18	18	55	64
Net (gains) losses on sold securities	0	0	17,135	0
Net Other-Than-Temporary Impairment Losses, credit portion	0	14	1,924	3,592
Compensation and Benefits	6,175	-570	6,874	-1,713
Total Other Comprehensive Income	10,975	38,680	24,960	72,511
AOCI Balance, Ending	14,902	'	14,902	'
Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
AOCI Balance, Beginning	3,927	-79,710	-10,058	-113,541
Net change in unrealized gains (losses)	4,866	'	-1,853	'
Net change in fair value	-84	'	35,095	'
Accretion of non-credit loss	18	'	55	'
Net (gains) losses on sold securities	0	'	-17,135	'
Net Other-Than-Temporary Impairment Losses, credit portion	0	'	1,924	'
Compensation and Benefits	6,175	'	6,874	'
Total Other Comprehensive Income	10,975	38,680	24,960	72,511
AOCI Balance, Ending	14,902	-41,030	14,902	-41,030
Unrealized Gains (Losses) on Investments [Member] | Available-for-sale Securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
AOCI Balance, Beginning	475	9,895	12,335	15,080
Net change in unrealized gains (losses)	2,392	'	-9,468	'
Total Other Comprehensive Income	2,392	3,606	-9,468	-1,579
AOCI Balance, Ending	2,867	13,501	2,867	13,501
Non-Credit OTTI [Member] | Available-for-sale Securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
AOCI Balance, Beginning	15,425	-79,157	-9,684	-119,274
Net change in unrealized gains (losses)	2,474	'	7,615	'
Net change in fair value	-84	'	35,095	'
Net (gains) losses on sold securities	0	'	-17,135	'
Net Other-Than-Temporary Impairment Losses, credit portion	0	'	1,924	'
Total Other Comprehensive Income	2,390	35,626	27,499	75,743
AOCI Balance, Ending	17,815	-43,531	17,815	-43,531
Non-Credit OTTI [Member] | Held-to-maturity Securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
AOCI Balance, Beginning	-275	-350	-312	-392
Accretion of non-credit loss	18	'	55	'
Total Other Comprehensive Income	18	18	55	60
AOCI Balance, Ending	-257	-332	-257	-332
Pension Benefits [Member]	'	'	'	'
Accumulated Other Comprehensive Income [Roll Forward]	'	'	'	'
AOCI Balance, Beginning	-11,698	-10,098	-12,397	-8,955
Compensation and Benefits	6,175	'	6,874	'
Total Other Comprehensive Income	6,175	-570	6,874	-1,713
AOCI Balance, Ending	($5,523)	($10,668)	($5,523)	($10,668)

Employee_Retirement_and_Deferr2

Employee Retirement and Deferred Compensation Plans - Defined Benefit Plan (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
SERP Expense Recorded in Compensation and Benefits	$14,101	$8,516	$33,153	$26,565
Pension Benefits	-6,175	570	-6,874	1,713
Supplemental Executive Retirement Plan [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Service Cost	136	224	592	667
Interest Cost	112	205	520	611
Amortization of Prior Service Benefit	-3	-3	-8	-8
Amortization of net actuarial loss (gain)	135	392	875	1,167
Defined Benefit Plan, Net Periodic Benefit Cost	380	818	1,979	2,437
Settlement loss	5,093	0	5,093	0
SERP Expense Recorded in Compensation and Benefits	5,473	818	7,072	2,437
Pension Benefits	-6,175	570	-6,874	1,713
Total recognized in Compensation and Benefits and in OCI	-702	1,388	198	4,150
CEO Milton Miller [Member] | Supplemental Executive Retirement Plan [Member]	'	'	'	'
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]	'	'	'	'
Settlement loss	$5,093	'	$5,093	'

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
			Segment
Segment Reporting Information [Line Items]	'	'	'	'	'
Number of primary operating segments	'	'	2	'	'
Net Interest Income	$52,126	$59,082	$173,133	$181,348	'
Provision for (Reversal of) Credit Losses	314	5,634	-3,451	7,917	'
Other Income (Loss)	551	-2,168	28,463	-8,655	'
Other Expenses	20,165	14,082	51,098	43,801	'
Income Before Assessments	32,198	37,198	153,949	120,975	'
Affordable Housing Program Assessments	3,442	4,056	16,066	13,157	'
Net Income	28,756	33,142	137,883	107,818	'
Assets	39,576,835	'	39,576,835	'	41,227,636
Traditional [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Interest Income	34,486	40,841	112,715	124,488	'
Provision for (Reversal of) Credit Losses	0	0	0	0	'
Other Income (Loss)	-856	-1,336	27,359	-4,967	'
Other Expenses	18,324	12,771	46,347	39,928	'
Income Before Assessments	15,306	26,734	93,727	79,593	'
Affordable Housing Program Assessments	1,753	3,010	10,044	9,019	'
Net Income	13,553	23,724	83,683	70,574	'
Assets	33,417,188	'	33,417,188	'	35,226,231
Mortgage Loans [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net Interest Income	17,640	18,241	60,418	56,860	'
Provision for (Reversal of) Credit Losses	314	5,634	-3,451	7,917	'
Other Income (Loss)	1,407	-832	1,104	-3,688	'
Other Expenses	1,841	1,311	4,751	3,873	'
Income Before Assessments	16,892	10,464	60,222	41,382	'
Affordable Housing Program Assessments	1,689	1,046	6,022	4,138	'
Net Income	15,203	9,418	54,200	37,244	'
Assets	$6,159,647	'	$6,159,647	'	$6,001,405

Estimated_Fair_Values_Carrying

Estimated Fair Values (Carrying Value and Fair Value of Financial Instruments) (Details) (USD $)	0 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Apr. 04, 2013	Sep. 30, 2013		Dec. 31, 2012
	Security	Security
Assets:	'	'		'
Interest-Bearing Deposits	'	$487		$48
AFS securities	'	3,688,783		3,980,580
HTM securities	'	7,437,226		7,738,596
Derivative Asset, net	'	7,655		821
Consolidated Obligations:	'	'		'
Federal Home Loan Bank, Consolidated Obligations, Discount Notes	'	7,804,773		8,924,085
Federal Home Loan Bank, Consolidated Obligations, Bonds	'	27,623,120		27,407,530
Derivative Liability	'	187,234		201,115
Private-Label RMBS [Member]	'	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'		'
Number of AFS securities sold	6	6		'
Assets:	'	'		'
AFS securities	'	488,569		640,142
Level 1 [Member]	'	'		'
Assets:	'	'		'
Cash and Due from Banks	'	514,383		105,472
Interest-Bearing Deposits	'	0		0
Securities Purchased Under Agreements to Resell	'	0		0
Federal Funds Sold	'	0		0
AFS securities	'	0		0
HTM securities	'	0		0
Advances	'	0		0
Mortgage Loans Held for Portfolio, net	'	0		0
Accrued Interest Receivable	'	0		0
Derivative Asset, net	'	0		0
Grantor Trust Assets (included in Other Assets)	'	12,061		18,440
Liabilities:	'	'		'
Deposits	'	0		0
Consolidated Obligations:	'	'		'
Federal Home Loan Bank, Consolidated Obligations, Discount Notes	'	0		0
Federal Home Loan Bank, Consolidated Obligations, Bonds	'	0		0
Accrued Interest Payable	'	0		0
Derivative Liability	'	0		0
MRCS	'	255,319		450,716
Level 2 [Member]	'	'		'
Assets:	'	'		'
Cash and Due from Banks	'	0		0
Interest-Bearing Deposits	'	487		48
Securities Purchased Under Agreements to Resell	'	2,700,000		3,250,000
Federal Funds Sold	'	245,000		2,110,000
AFS securities	'	3,200,214		3,340,438
HTM securities	'	7,260,140		7,490,101
Advances	'	18,900,794		18,298,372
Mortgage Loans Held for Portfolio, net	'	6,256,720		6,265,990
Accrued Interest Receivable	'	81,966		87,455
Derivative Asset, net	'	115,613		73,578
Grantor Trust Assets (included in Other Assets)	'	0		0
Liabilities:	'	'		'
Deposits	'	1,114,509		1,787,151
Consolidated Obligations:	'	'		'
Federal Home Loan Bank, Consolidated Obligations, Discount Notes	'	7,806,128		8,925,828
Federal Home Loan Bank, Consolidated Obligations, Bonds	'	27,710,117		28,162,392
Accrued Interest Payable	'	94,866		87,777
Derivative Liability	'	691,361		951,521
MRCS	'	0		0
Level 3 [Member]	'	'		'
Assets:	'	'		'
Cash and Due from Banks	'	0		0
Interest-Bearing Deposits	'	0		0
Securities Purchased Under Agreements to Resell	'	0		0
Federal Funds Sold	'	0		0
AFS securities	'	488,569		640,142
HTM securities	'	177,086		248,495
Advances	'	0		0
Mortgage Loans Held for Portfolio, net	'	48,610		52,993
Accrued Interest Receivable	'	0		0
Derivative Asset, net	'	0		0
Grantor Trust Assets (included in Other Assets)	'	0		0
Liabilities:	'	'		'
Deposits	'	0		0
Consolidated Obligations:	'	'		'
Federal Home Loan Bank, Consolidated Obligations, Discount Notes	'	0		0
Federal Home Loan Bank, Consolidated Obligations, Bonds	'	0		0
Accrued Interest Payable	'	0		0
Derivative Liability	'	0		0
MRCS	'	0		0
Netting Adjustment [Member]	'	'		'
Assets:	'	'		'
Cash and Due from Banks	'	0	[1]	0	[1]
Interest-Bearing Deposits	'	0	[1]	0	[1]
Securities Purchased Under Agreements to Resell	'	0	[1]	0	[1]
Federal Funds Sold	'	0	[1]	0	[1]
AFS securities	'	0	[1]	0	[1]
HTM securities	'	0	[1]	0	[1]
Advances	'	0	[1]	0	[1]
Mortgage Loans Held for Portfolio, net	'	0	[1]	0	[1]
Accrued Interest Receivable	'	0	[1]	0	[1]
Derivative Asset, net	'	-107,958	[1]	-72,757	[1]
Grantor Trust Assets (included in Other Assets)	'	0	[1]	0	[1]
Liabilities:	'	'		'
Deposits	'	0	[1]	0	[1]
Consolidated Obligations:	'	'		'
Federal Home Loan Bank, Consolidated Obligations, Discount Notes	'	0	[1]	0	[1]
Federal Home Loan Bank, Consolidated Obligations, Bonds	'	0	[1]	0	[1]
Accrued Interest Payable	'	0	[1]	0	[1]
Derivative Liability	'	-504,127	[1]	-750,406	[1]
MRCS	'	0	[1]	0	[1]
Carrying Value [Member]	'	'		'
Assets:	'	'		'
Cash and Due from Banks	'	514,383		105,472
Interest-Bearing Deposits	'	487		48
Securities Purchased Under Agreements to Resell	'	2,700,000		3,250,000
Federal Funds Sold	'	245,000		2,110,000
AFS securities	'	3,688,783		3,980,580
HTM securities	'	7,321,459		7,504,643
Advances	'	18,796,297		18,129,458
Mortgage Loans Held for Portfolio, net	'	6,159,647		6,001,405
Accrued Interest Receivable	'	81,966		87,455
Derivative Asset, net	'	7,655		821
Grantor Trust Assets (included in Other Assets)	'	12,061		18,440
Liabilities:	'	'		'
Deposits	'	1,114,509		1,787,151
Consolidated Obligations:	'	'		'
Federal Home Loan Bank, Consolidated Obligations, Discount Notes	'	7,804,773		8,924,085
Federal Home Loan Bank, Consolidated Obligations, Bonds	'	27,623,120		27,407,530
Accrued Interest Payable	'	94,866		87,777
Derivative Liability	'	187,234		201,115
MRCS	'	255,319		450,716
Fair Value [Member]	'	'		'
Assets:	'	'		'
Cash and Due from Banks	'	514,383		105,472
Interest-Bearing Deposits	'	487		48
Securities Purchased Under Agreements to Resell	'	2,700,000		3,250,000
Federal Funds Sold	'	245,000		2,110,000
AFS securities	'	3,688,783		3,980,580
HTM securities	'	7,437,226		7,738,596
Advances	'	18,900,794		18,298,372
Mortgage Loans Held for Portfolio, net	'	6,305,330		6,318,983
Accrued Interest Receivable	'	81,966		87,455
Derivative Asset, net	'	7,655		821
Grantor Trust Assets (included in Other Assets)	'	12,061		18,440
Liabilities:	'	'		'
Deposits	'	1,114,509		1,787,151
Consolidated Obligations:	'	'		'
Federal Home Loan Bank, Consolidated Obligations, Discount Notes	'	7,806,128		8,925,828
Federal Home Loan Bank, Consolidated Obligations, Bonds	'	27,710,117		28,162,392
Accrued Interest Payable	'	94,866		87,777
Derivative Liability	'	187,234		201,115
MRCS	'	$255,319		$450,716
[1]	Amounts represent the application of the netting requirements that allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing agent and/or counterparty.

Estimated_Fair_Values_Estimate

Estimated Fair Values (Estimated Fair Value on a Recurring Basis) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	$3,688,783		$3,980,580
Derivative Assets:	'		'
Derivative Assets - Mortgage delivery commitments	3,233		2,281
Derivative Asset, net	7,655		821
Derivative Liabilities:	'		'
Derivative Liabilities - Mortgage delivery commitments	2,818		305
Derivative Liability, net	187,234		201,115
Mortgage Delivery Commitments [Member]	'		'
Derivative Assets:	'		'
Derivative Assets - Mortgage delivery commitments	1,247		289
Derivative Liabilities:	'		'
Derivative Liabilities - Mortgage delivery commitments	0		29
Private-Label RMBS [Member]	'		'
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	488,569		640,142
Level 1 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Grantor Trust Assets (included in Other Assets)	12,061		18,440
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	0		0
Derivative Assets:	'		'
Derivative Asset, net	0		0
Derivative Liabilities:	'		'
Derivative Liability, net	0		0
Level 2 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Grantor Trust Assets (included in Other Assets)	0		0
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	3,200,214		3,340,438
Derivative Assets:	'		'
Derivative Asset, net	115,613		73,578
Derivative Liabilities:	'		'
Derivative Liability, net	691,361		951,521
Level 3 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Grantor Trust Assets (included in Other Assets)	0		0
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	488,569		640,142
Derivative Assets:	'		'
Derivative Asset, net	0		0
Derivative Liabilities:	'		'
Derivative Liability, net	0		0
Netting Adjustment [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Grantor Trust Assets (included in Other Assets)	0	[1]	0	[1]
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	0	[1]	0	[1]
Derivative Assets:	'		'
Derivative Asset, net	-107,958	[1]	-72,757	[1]
Derivative Liabilities:	'		'
Derivative Liability, net	-504,127	[1]	-750,406	[1]
Recurring [Member] | Fair Value [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Grantor Trust Assets (included in Other Assets)	12,061		18,440
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	3,688,783		3,980,580
Derivative Assets:	'		'
Derivative Assets - Interest-rate related	6,408		302
Derivative Assets - Interest-rate futures/forwards	0		230
Derivative Asset, net	7,655		821
Total recurring assets at estimated fair value	3,708,499		3,999,841
Derivative Liabilities:	'		'
Derivative Liabilities - Interest-rate related	184,755		201,043
Derivative Liabilities - Interest-rate futures/forwards	2,479		43
Derivative Liability, net	187,234		201,115
Total recurring liabilities at estimated fair value	187,234		201,115
Recurring [Member] | Fair Value [Member] | Mortgage Delivery Commitments [Member]	'		'
Derivative Assets:	'		'
Derivative Assets - Mortgage delivery commitments	1,247		289
Derivative Liabilities:	'		'
Derivative Liabilities - Mortgage delivery commitments	0		29
Recurring [Member] | Fair Value [Member] | GSE and TVA Debentures [Member]	'		'
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	3,200,214		3,340,438
Recurring [Member] | Fair Value [Member] | Private-Label RMBS [Member]	'		'
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	488,569		640,142
Recurring [Member] | Level 1 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Grantor Trust Assets (included in Other Assets)	12,061		18,440
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	0		0
Derivative Assets:	'		'
Derivative Assets - Interest-rate related	0		0
Derivative Assets - Interest-rate futures/forwards	0		0
Derivative Asset, net	0		0
Total recurring assets at estimated fair value	12,061		18,440
Derivative Liabilities:	'		'
Derivative Liabilities - Interest-rate related	0		0
Derivative Liabilities - Interest-rate futures/forwards	0		0
Derivative Liability, net	0		0
Total recurring liabilities at estimated fair value	0		0
Recurring [Member] | Level 1 [Member] | Mortgage Delivery Commitments [Member]	'		'
Derivative Assets:	'		'
Derivative Assets - Mortgage delivery commitments	0		0
Derivative Liabilities:	'		'
Derivative Liabilities - Mortgage delivery commitments	0		0
Recurring [Member] | Level 1 [Member] | GSE and TVA Debentures [Member]	'		'
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	0		0
Recurring [Member] | Level 1 [Member] | Private-Label RMBS [Member]	'		'
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	0		0
Recurring [Member] | Level 2 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Grantor Trust Assets (included in Other Assets)	0		0
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	3,200,214		3,340,438
Derivative Assets:	'		'
Derivative Assets - Interest-rate related	114,366		73,059
Derivative Assets - Interest-rate futures/forwards	0		230
Derivative Asset, net	115,613		73,578
Total recurring assets at estimated fair value	3,315,827		3,414,016
Derivative Liabilities:	'		'
Derivative Liabilities - Interest-rate related	688,882		951,449
Derivative Liabilities - Interest-rate futures/forwards	2,479		43
Derivative Liability, net	691,361		951,521
Total recurring liabilities at estimated fair value	691,361		951,521
Recurring [Member] | Level 2 [Member] | Mortgage Delivery Commitments [Member]	'		'
Derivative Assets:	'		'
Derivative Assets - Mortgage delivery commitments	1,247		289
Derivative Liabilities:	'		'
Derivative Liabilities - Mortgage delivery commitments	0		29
Recurring [Member] | Level 2 [Member] | GSE and TVA Debentures [Member]	'		'
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	3,200,214		3,340,438
Recurring [Member] | Level 2 [Member] | Private-Label RMBS [Member]	'		'
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	0		0
Recurring [Member] | Level 3 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Grantor Trust Assets (included in Other Assets)	0		0
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	488,569		640,142
Derivative Assets:	'		'
Derivative Assets - Interest-rate related	0		0
Derivative Assets - Interest-rate futures/forwards	0		0
Derivative Asset, net	0		0
Total recurring assets at estimated fair value	488,569		640,142
Derivative Liabilities:	'		'
Derivative Liabilities - Interest-rate related	0		0
Derivative Liabilities - Interest-rate futures/forwards	0		0
Derivative Liability, net	0		0
Total recurring liabilities at estimated fair value	0		0
Recurring [Member] | Level 3 [Member] | Mortgage Delivery Commitments [Member]	'		'
Derivative Assets:	'		'
Derivative Assets - Mortgage delivery commitments	0		0
Derivative Liabilities:	'		'
Derivative Liabilities - Mortgage delivery commitments	0		0
Recurring [Member] | Level 3 [Member] | GSE and TVA Debentures [Member]	'		'
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	0		0
Recurring [Member] | Level 3 [Member] | Private-Label RMBS [Member]	'		'
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	488,569		640,142
Recurring [Member] | Netting Adjustment [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'		'
Grantor Trust Assets (included in Other Assets)	0	[1]	0	[1]
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	0	[1]	0	[1]
Derivative Assets:	'		'
Derivative Assets - Interest-rate related	-107,958	[1]	-72,757	[1]
Derivative Assets - Interest-rate futures/forwards	0	[1]	0	[1]
Derivative Asset, net	-107,958	[1]	-72,757	[1]
Total recurring assets at estimated fair value	-107,958	[1]	-72,757	[1]
Derivative Liabilities:	'		'
Derivative Liabilities - Interest-rate related	-504,127	[1]	-750,406	[1]
Derivative Liabilities - Interest-rate futures/forwards	0	[1]	0	[1]
Derivative Liability, net	-504,127	[1]	-750,406	[1]
Total recurring liabilities at estimated fair value	-504,127	[1]	-750,406	[1]
Recurring [Member] | Netting Adjustment [Member] | Mortgage Delivery Commitments [Member]	'		'
Derivative Assets:	'		'
Derivative Assets - Mortgage delivery commitments	0	[1]	0	[1]
Derivative Liabilities:	'		'
Derivative Liabilities - Mortgage delivery commitments	0	[1]	0	[1]
Recurring [Member] | Netting Adjustment [Member] | GSE and TVA Debentures [Member]	'		'
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	0	[1]	0	[1]
Recurring [Member] | Netting Adjustment [Member] | Private-Label RMBS [Member]	'		'
AFS securities:	'		'
Available-for-Sale Securities (Notes 3 and 5)	$0	[1]	$0	[1]
[1]	Amounts represent the application of the netting requirements that allow us to settle positive and negative positions and also cash collateral and related accrued interest held or placed with the same clearing agent and/or counterparty.

Estimated_Fair_Values_Level_3_

Estimated Fair Values (Level 3 Reconciliation) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'	'
Net change in fair value not in excess of cumulative non-credit losses in OCI	($84)	$32,311	$35,095	$64,096
Reclassification of non-credit portion in OCI to Other Income (Loss)	0	14	1,924	3,592
Recurring [Member] | Level 2 [Member] | Private-Label RMBS [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'	'
Transfers out	'	'	-124,179	'
Recurring [Member] | Level 3 [Member] | Private-Label RMBS [Member]	'	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'	'
Balance, beginning of period	511,952	602,975	640,142	601,309
Accretion of credit losses in Net Interest Income	37	89	95	644
Net gains (losses) on changes in fair value in Other Income (Loss)	0	-14	0	-3,592
Net change in fair value not in excess of cumulative non-credit losses in OCI	-84	32,311	12,625	64,096
Unrealized gains (losses) in OCI	2,474	3,301	16,843	8,055
Reclassification of non-credit portion in OCI to Other Income (Loss)	0	14	0	3,592
Settlements	-25,810	-17,735	-56,957	-53,163
Transfers out	0	0	-124,179	'
Balance, end of period	488,569	620,941	488,569	620,941
Net gains (losses) included in earnings attributable to changes in fair value relating to assets still held at end of period	$37	$75	$95	($2,948)

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Loss Contingencies [Line Items]	'		'
Cash collateral pledged	$396,944		$677,550
Maximum [Member]	'		'
Loss Contingencies [Line Items]	'		'
Commitments to fund additional Advances are generally for periods up	'6 months		'
Standby Letters of Credit Outstanding [Member]	'		'
Loss Contingencies [Line Items]	'		'
Off-balance-sheet commitments expire within one year	112,594		'
Off-balance-sheet commitments expire after one year	153,433		'
Off-balance-sheet commitments,Total	266,027		'
Unused Lines of Credit [Member]	'		'
Loss Contingencies [Line Items]	'		'
Off-balance-sheet commitments expire within one year	793,552		'
Off-balance-sheet commitments expire after one year	0		'
Off-balance-sheet commitments,Total	793,552		'
Commitments to Fund Additional Advances [Member]	'		'
Loss Contingencies [Line Items]	'		'
Off-balance-sheet commitments expire within one year	20,550	[1]	'
Off-balance-sheet commitments expire after one year	0	[1]	'
Off-balance-sheet commitments,Total	20,550	[1]	'
Commitments to Fund or Purchase Mortgage Loans and Participation Interest [Member]	'		'
Loss Contingencies [Line Items]	'		'
Off-balance-sheet commitments expire within one year	101,983		'
Off-balance-sheet commitments expire after one year	0		'
Off-balance-sheet commitments,Total	101,983		'
Unsettled CO Bonds, at par [Member]	'		'
Loss Contingencies [Line Items]	'		'
Off-balance-sheet commitments expire within one year	1,010,000	[2]	'
Off-balance-sheet commitments expire after one year	0	[2]	'
Off-balance-sheet commitments,Total	1,010,000	[2]	'
Unsettled CO Bonds, at par [Member] | Interest Rate Swaps [Member]	'		'
Loss Contingencies [Line Items]	'		'
Off-balance-sheet commitments,Total	$1,000,000		'
[1]	Commitments to fund additional Advances are generally for periods up to six months and include no outstanding commitments to issue standby letters of credit.
[2]	Unsettled CO Bonds of $1,000,000 were hedged with associated interest-rate swaps.

Transactions_with_Related_Part2

Transactions with Related Parties (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Related Party Transaction [Line Items]	'		'		'		'		'
Advances at par value	$18,365,493,000		'		$18,365,493,000		'		$17,382,219,000
Mortgage Loans Held for Portfolio, UPB	6,061,373,000		'		6,061,373,000		'		5,926,144,000
Mortgage loans acquired	'		'		1,263,177,000		1,006,139,000		'
Service Fees	225,000		236,000		684,000		723,000		'
Flagstar Bank, FSB [Member]	'		'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'		'
Capital Stock, including MRCS, par value	301,737,000		'		301,737,000		'		301,737,000
Capital Stock, including MRCS, % of Total	16.00%		'		16.00%		'		14.00%
Advances at par value	2,907,598,000		'		2,907,598,000		'		3,180,000,000
Advances, % of Total	16.00%		'		16.00%		'		18.00%
Mortgage Loans Held for Portfolio, UPB	554,658,000	[1]	'		554,658,000	[1]	'		656,931,000	[1]
Mortgage Loans Held for Portfolio, % of Total	9.00%	[1]	'		9.00%	[1]	'		11.00%	[1]
Net advances to (repayments from)	7,598,000		-312,000,000		-272,402,000		-865,000,000		'
Bank of America N A [Member]	'		'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'		'
Capital Stock, including MRCS, par value	'		'		'		'		224,921,000
Capital Stock, including MRCS, % of Total	'		'		'		'		11.00%
Advances at par value	'		'		'		'		300,000,000
Advances, % of Total	'		'		'		'		2.00%
Mortgage Loans Held for Portfolio, UPB	'		'		'		'		1,210,009,000	[1]
Mortgage Loans Held for Portfolio, % of Total	'		'		'		'		20.00%	[1]
Net advances to (repayments from)	0	[2]	0	[2]	0	[2]	-100,000,000	[2]	'
Directors' Financial Institutions [Member]	'		'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'		'
Capital Stock, including MRCS, par value	42,842,000		'		42,842,000		'		74,114,000
Capital Stock, including MRCS, % of Total	2.00%		'		2.00%		'		4.00%
Advances at par value	238,815,000		'		238,815,000		'		462,758,000
Advances, % of Total	1.00%		'		1.00%		'		3.00%
Mortgage Loans Held for Portfolio, UPB	78,774,000	[3]	'		78,774,000	[3]	'		74,235,000	[3]
Mortgage Loans Held for Portfolio, % of Total	1.00%	[3]	'		1.00%	[3]	'		1.00%	[3]
Net advances to (repayments from)	13,678,000		-18,931,000		-108,340,000		-21,717,000		'
Mortgage loans acquired	8,110,000		12,515,000		21,271,000		24,854,000		'
Related Parties Holding 10% or more of our Capital Stock and MRCS [Member]	'		'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'		'
Capital Stock, including MRCS, par value	301,737,000	[4]	'		301,737,000	[4]	'		526,658,000
Capital Stock, including MRCS, % of Total	16.00%	[4]	'		16.00%	[4]	'		25.00%
Advances at par value	2,907,598,000	[4]	'		2,907,598,000	[4]	'		3,480,000,000
Advances, % of Total	16.00%	[4]	'		16.00%	[4]	'		20.00%
Mortgage Loans Held for Portfolio, UPB	554,658,000	[1],[4]	'		554,658,000	[1],[4]	'		1,866,940,000	[1]
Mortgage Loans Held for Portfolio, % of Total	9.00%	[1],[4]	'		9.00%	[1],[4]	'		31.00%	[1]
FHLBank of Topeka [Member]	'		'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'		'
Payments for participation interests	53,581,000		65,338,000		309,477,000		65,338,000		'
FHLBank of Chicago [Member]	'		'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'		'
Service Fees	$68,000		$2,000		$160,000		$2,000		'
[1]	Represents UPB of mortgage loans purchased from related party.
[2]	Bank of America, N.A. did not meet the definition of a related party following our repurchase of excess stock in February 2013.
[3]	Represents UPB of mortgage loans purchased from Directors' Financial Institutions.
[4]	Bank of America, N.A. did not meet the definition of a related party as of SeptemberB 30, 2013 as a result of our repurchase of excess stock in February 2013.

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	9 Months Ended		1 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Oct. 31, 2013	Oct. 31, 2013
		Member or former members [Member]	Subsequent Event [Member]	Subsequent Event [Member]
			Member or former members [Member]	MRCS [Member]
				Member or former members [Member]
Subsequent Event [Line Items]	'	'	'	'
Intended repurchase of excess stock held, par value	$250,000	$250,000	'	'
Shares repurchased that were contractually due in 2013, amount	'	'	13,952	'
Shares repurchased that were not contractually due until 2014 or later, amount	'	'	236,048	'
Additional excess stock redeemed	'	$40,975	$95,489	$154,511